Postgresql case when luserid > 0 then sa. -- first update, set value1 to 1 and value2 for all rows UPDATE MyTable set value1 = 1,value2 = 2; -- next query. select x,y, case when x = 1 then case when y = 1 then 11 else 12 end when x = 2 then case when y = 1 then 21 else 22 end else 99 end myExression from test; Apr 16, 2015 · I use complex CASE WHEN for selecting values. How to write CASE WHEN in WHERE Clause in Postgres? 0. 5 LOOP loop_res := loop_res + i; END LOOP; res := loop_res; END CASE; which is a PL/PgSQL CASE . Due to its extensive feature set, PostgreSQL is a preferred option for DBAs and developers. postgres CASE and where clause. naam I have this table | user | Mark | Points | |--------------|------------|----------| | John | 0 | 2 | | Paul | 5 | 3 | | John Feb 21, 2018 · PostgreSQL does not support the SQL standard feature “Comma-separated predicates in simple CASE expression” (F263), so you cannot do that. PostgreSQL 函数中的 CASE 用法. How to use Postgres CASE simple/short-hand syntax Aug 4, 2017 · PostgreSQL use case when result in where clause. VACUUMとは、VACUUM FULLの実行【PostgreSQL】 9. CASE 表达式的基本语法. See examples of simple and complex CASE statements with aliases and NULL values. You'll have to use a construct like: CASE CASE WHEN expression1 THEN value1 WHEN expression2 THEN value2 ELSE value3 END WHEN 1 THEN 'A' WHEN 2 THEN 'A' WHEN 3 THEN 'B' WHEN 4 THEN 'B' ELSE 'C' END Aug 30, 2021 · -- this works: SELECT CASE WHEN 1 IN (1, 2) THEN 'works' ELSE 'weird' END; case ═══════ works (1 row) The reason is that in the first statement, the inner parentheses are forming a composite type ( record ) with two elements, and PostgreSQL doesn't know how to compare that to the integer 1. The following describes the general form of a PostgreSQL case with WHEN-THEN construct - CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 ELSE result_n END Here are some critical points that you should keep in mind while constructing CASEs in PostgreSQL: May 11, 2021 · for each row of the dataset i need to make a assignment with some criterion. 1. You need to use dynamically generated sql if you want to handle such scenarios (check whether the column exists and create the appropriate sql statement). postgresql case when date and sorting by date. Internally, every SIMILAR TO expression is rewritten with a regular expression. create function test() returns trigger as $$ begin if new. I want to use a CASE Nov 25, 2016 · Postgres 9. 구문 CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 [WHEN] [ELSE else_result] END 여기서 ELSE 부분 역시 생략이 가능하지만 위에서 만족하는 조건이 없으면 NULL을 반환하니 상황에 따라 뭐라도 넣어주는것이 좋을 수 있다. Problems with Postgresql CASE syntax. 2. 5. Using CASE to find a certain integer and return a string. Feb 1, 2016 · UPDATE with WITH and CASE - PostgreSQL. PostgreSQL supports CASE expression which is the same as if/else statements of other programming languages. SQL to return another table's value when CASE statement is true. 4. PostgreSQL 9. Issue with case when SQL. ただし、case式は「式」なので結果は必ず単純な「値」になります。例えば、「1」や「'a'」のようになります。 #case式の使い方 case式には単純case式と検索case式の2種類あります。いずれも似たようなことができます。 以下に簡単な例を示します。 ##単純case式 Postgresql - Exemplo CASE WHEN Case é uma expressão condicional, similar a if/else em outras linguagens de programação. Many will work both in SQL Server and Postgres, like using the ROW_NUMBER() function:. If the ELSE clause is omitted and no condition matches, the result is null. CASE Dec 13, 2024 · 複雑な case 式を複数のシンプルな case 式に分割してください。 複雑な case 式は、理解しにくくなる場合があります。 コメントを使用して、コードを説明してください。 わかりやすい変数名を使用してください。 case 式を複数の小さな式に分割してください。 PostgreSQL CASE Expressions: If-else in Select Query. 2. PostgreSQL using CASE WHEN Mar 18, 2014 · Postgresql LEFT JOIN with CASE condition. Example 1: General CASE Expression. Simple CASE expression in SQL. empid, c. Learn how to use the CASE expression in PostgreSQL to return different values based on conditions. 12. empid ORDER BY c. Update table with IF statement in Postgresql. 2 Jan 9, 2020 · PostgreSQL: using case to compare values between columns. org Feb 1, 2024 · When a condition evaluates to false, the CASE expression evaluates the next condition from top to bottom until it finds a condition that evaluates to true. Ask Question Asked 8 years, 11 months ago. Sql concatenate result on case. query case when postgresql. user19471184 user19471184. How to skip case statement in sql? 3. And if you want to change the value that is stored in the table, you need to modify the new record:. Multiple case statements. Feb 27, 2017 · You can't define a column in the WHERE clause. See practical examples of applying the CASE statement with aggregate functions, WHERE clause, and SELECT statement. You can - and only do that - in the SELECT list. GREATEST and LEAST This section describes the SQL-compliant conditional expressions available … Oct 8, 2024 · Feel free to use similar syntax to use a CASE WHEN statement with multiple conditions in your own table in PostgreSQL. lgroupid = g. The examples in the documentation are not executing statements that return a value; just variable assignment. このセクションでは、PostgreSQL で使用できる SQL 準拠の条件式について説明します。 Tip. May 19, 2016 · There are many ways to do this. The block is as follows: (case when four. How can I cast inside a case statement SQL. so for example: id ValA ValB ValC Vald 1 4 2 1 NULL 2 11 1 5 6 3 2 NULL 1 8 4 NULL 3 2 NULL I need a new table lik Feb 15, 2022 · You want an IF statement. PG SQL case when with multiple conditions - simplier way to write statement? Hot Network Questions select case when sa. pay, ROW_NUMBER() OVER (PARTITION BY c. PostgreSQL , CASE WHEN. I'm trying to change the Mar 16, 2019 · You can use a CASE like this: ON CONFLICT ON CONSTRAINT release_auth_planting_uniq DO UPDATE SET data = EXCLUDED. bedrag) AS varchar) IS NULL THEN 0 END as gemiddelde FROM spelers s LEFT OUTER JOIN boetes b ON s. PostgreSQL case statement for mutliple date fields. PostgreSQL UPDATE statement with CASE and multiple conditions. enumber, e. The CASE expression can be used with SELECT, WHERE, GROUP BY, and HAVING clauses. 6. 在本文中，我们将介绍如何在 PostgreSQL 数据库的函数中使用 CASE 表达式。CASE 表达式是一种条件语句，可以根据不同的条件返回不同的结果。 阅读更多：PostgreSQL 教程. PostgreSQL SUM CASE expression with THEN 1 THEN 0 ELSE 0. naam ORDER BY s. Jul 31, 2014 · I'm using a case when block in postgresql to determine how results will be displayed. CASE WHEN condition 1 AND condition 2 then x else y postgreSQL. naam, CASE WHEN AVG(b. query with case when. Postgres CASE WHEN IN query. Hot Network Questions Time travel short story: Someone travels back in time to the start of the 18th or 19th May 20, 2013 · CASE WHEN some_variable < 3 THEN res := 0; WHEN some_variable >= 3 THEN FOR i IN 1. PostgreSQL use case when result in where clause. So you don't need a SELECT there. COALESCE 9. According to PostgreSQL documentation, simple CASE expressions are ideal when you know ahead of time all the possible values that need to be accounted for. CASE 9. Case expression in postgres. 嵌套IF查询 Dec 15, 2021 · postgresql; case; Share. 1. In the first query, the condition in the CASE expression depends on phonecalls. Improve this question. lgroupid > 0 then sa. 99 then 1 else 0 end ) as "aa", sum( case when rental_rate=2. luserid = u. Case文（複数条件分岐、Case When）【PostgreSQL】 7. PostgreSQL 中的嵌套IF和CASE查询. When v1 equals v2, I want it to say 1, when v1 DOES NOT EQUAL v2 , I would like to say 2. 33. 3. Apr 16, 2022 · We can nest CASE expressions, or use multiple tests if appropriate. Modified 10 years, 10 months ago. pgsql case when 嵌套多层优化 在PGSQL中，CASE WHEN语句是一种流程控制语句，可以根据条件执行不同的操作。而在实际应用中，往往会涉及到多层嵌套的情况，为了提高代码的可读性和执行效率，我们需要对多层嵌套的CASE WHEN语句进行优化。 Jan 19, 2012 · PostgreSQL CASE Function. There is no shortcut. 在本文中，我们将介绍如何在PostgreSQL中使用CASE WHEN语句在选择查询中进行条件判断和结果返回。CASE WHEN语句是一种强大的工具，它允许我们根据给定的条件进行灵活的逻辑判断，并返回不同的结果。 阅读更多：PostgreSQL 教程 Nov 18, 2020 · PostgreSQL, CASE WHEN and IF. 3. 95 end if; return new; end $$ language plpgsql; Oct 11, 2021 · I know with Postgres CASE expression, you can simplify it down to: SELECT a, CASE a WHEN 1 THEN 'one' WHEN 2 THEN 'two' ELSE 'other' END FROM test; Mar 2, 2022 · Using CASE in PostgreSQL to SELECT different FROMs. 0. id order by case when 'user selection' = 'all objects by user' then case when sa. The whole approach looks bizarre, but you're only showing dummy code so I can't really say what you're really trying to do. Add Mar 1, 2013 · Postgresql - CASE/WHEN with wrong return. You need a place for the result of the CASE expression to be stored. I would like to use this result in WHERE clause, but Postgres says column 'd' does not exists. Also, you need an END after the last statement of the CASE. Oracle SQL CASE WHEN IS NULL. CASE statement in SELECT in PostgreSQL [duplicate] Ask Question Asked 6 years, 11 months ago. 6 using case-when clause based on sum of the column. 通过使用 PostgreSQL 中的 CASE … END 结构，我们能够根据多个条件执行不同的操作或返回不同的值。简单 CASE 结构适用于根据单个表达式的结果执行操作，而搜索 CASE 结构适用于根据多个条件进行操作。 Jul 19, 2017 · The whole sql statement is parsed and compiled before it is run, therefore postgresql will complain of the missing field. expiration > (current_date + int Sep 1, 2016 · @legacy - the CASE in JOIN condition is pretty big trap for optimizer - probably Postgres's planner selected nested loop based plan - and your example is Cartesian product 3500*3500 rows, and you have to evaluate CASE expression for every combination - so 5sec is pretty fine time for pretty unhappy query. Ask Question Asked 10 years, 10 months ago. 1 Issue with case when SQL . 99 then 1 else 0 end ) as "bb", sum( case when rental_rate=4. Viewed 8k times Apr 25, 2016 · Well, realize that the pseudo-column 'employeecolor' needs to be a single type. PostgreSQL CASE statement. How to count number of Cases in SQL? 1. . TRY_CONVERT in CASE WHEN. Apr 10, 2020 · PostgreSQL的case when语句 case when语句第一种方式： case when 表达式1 then 结果1 when 表达式2 then 结果2 else 结果n end 举例1： select sum( case when rental_rate=0. PostgreSQL: Add condition in where clause using CASE. spelersnr GROUP BY s. Nov 16, 2020 · PostgreSQL , CASE WHEN. It evaluates conditions and returns specific results based on whether the condition is true or false. lgroupid when sa. The following tutorials explain how to perform other common tasks in PostgreSQL: PostgreSQL: How to Count Occurrences of Each Value in Column PostgreSQL: How to Count Number of Occurrences of Character in Apr 26, 2015 · when i use a statement as case condition it always returns false;. id DESC) AS rn FROM employee AS e INNER JOIN humanr AS c ON e. PostgreSQL using CASE WHEN in a select query. 各バージョンのサポート期限のまとめ【PostgreSQL】 5. luserid > 0 then sa Dec 5, 2012 · @EugenKonkov: In this particular case, the version with LEFT JOIN rtd2 avoids reading from rdt2 altogether when the condition isn't met, so it will be cheaper. It's commonly used in SELECT statements, but can also be used in WHERE, ORDER BY, and other SQL clauses. price is null then new. Additional Resources. bedrag), 2) ELSE CAST(AVG(b. WITH cte AS ( SELECT e. 4 CASE WHEN with OR. These 2 example give the same result. PostgreSQL: using case to compare values between columns. CASE-WHEN within function POSTGRESQL. 这里是 PostgreSQL CASE 表达式的语法： postgresql case when语句中使用or条件 在本文中，我们将介绍如何在postgresql的case when语句中使用or条件。case when语句是一种用于根据条件执行不同操作的流程控制语句。通过使用or条件，我们可以在case when语句中简化条件的表达式，并实现更灵活的逻辑判断。 Sep 6, 2012 · Postgresql "Column must appear in the GROUP BY clause or be used in an aggregate function" when using CASE expression inside ORDER BY clause Hot Network Questions Do I really need to keep the username for a shared user in HTTP Basic auth private? Feb 18, 2011 · PostgreSQL use case when result in where clause. Dec 23, 2024 · The CASE WHEN expression is used to implement conditional logic in SQL queries. 1 PostgreSQL CASE statement. Modified 6 years, 7 months ago. name, CASE WHEN t. spelersnr = b. Raising exception in postgresql. For example, this is a possible way of avoiding a Jun 26, 2015 · In postgresql, I have a case statement that I need to add a "not equals" clause. SELECT kios. new_book := new. Here we will work on the film table of the sample database. Besides that, the alias of the column should go after the END:. ORDER BY CASE WHEN boolean_column is true THEN text_column END ASC, CASE WHEN boolean_column is false THEN text_column END DESC Is it somehow possible to replace the second CASE in an ELSE? It feels odd to have two conditions instead of a regular if else/when else as you normally would do. destination_host) THEN 'typeA' ELSE 'typeB' END FROM table_b; With queries like that, you have to take care of NULL values. Jan 6, 2023 · postgresql; case; Share. Oct 2, 2024 · まずはcase whenの基本的な構文を確認しましょう。 case whenはsqlにおける条件分岐の一つで、条件に応じて異なる結果を返すことができます。 基本的な構文. 5: Exception handling. luserid when sa. Follow asked Dec 15, 2021 at 23:18. Modified 8 years, 11 months ago. Follow edited Jan 6, 2023 at 7:53. Add Case Statement in Where Clause. create table test ( v1 varchar(20), v2 varchar(20) ); insert into test values ('Albert','Al'),('Ben','Ben') select case v1 when v2 then 1 else 3 end from test Sep 19, 2022 · PostgreSQL CASE 表达式是一个条件表达式，它与其他编程语言中的 if-else 语句作用相同。 您可以在 SELECT 语句以及 WHERE, GROUP BY, 和 HAVING 子句中使用 CASE 表达式。 PostgreSQL CASE 语法. Sep 25, 2015 · PostgreSQL: Case with conditions based on two columns. Case when then in postgresql doesn't work as expected (on null value) 1. Nov 21, 2024 · Learn how to use the SQL CASE expression in PostgreSQL, a generic conditional expression similar to if/else statements in other programming languages. host = table_b. lldapid > 0 then sa. SQL CASE…WHEN语句在Postgresql的WHERE子句中的应用非常灵活，可以根据具体的需求进行灵活 Aug 7, 2013 · PostgreSQL 9. 18. Feb 16, 2023 · Learn how to use the CASE statement to create conditional queries in PostgreSQL with two forms: searched and simple. Avoid calling COUNT twice in CASE expression (PostgreSQL) 2. Learn how to write a CASE statement in PostgreSQL to conditionally transform data in your SQL queries based on specified conditions, similar to using an IF statement. If it wasn't for that, CASE with a simple equality check is very cheap - even if more verbose - and alternatives (with more overhead) could only compete when involving more than a handful of expressions. CASE WHEN with OR. Jul 12, 2021 · SELECT CASE WHEN EXISTS (SELECT 1 FROM subquery WHERE subquery. pseudo IF/Case help. Conditional Expressions 9. data, modified_date = NOW(), status = CASE WHEN release_auth. How to use Postgres CASE simple/short-hand syntax with multiple conditions? 0. Postgres 10: raise exception or perform an update Aug 14, 2017 · PostgreSQL CASE usage in functions. This question . case whenは以下のように記述します。 case when 条件1 then 結果1 when 条件2 then 結果2 else 結果3 end Jul 22, 2024 · CASE expression WHEN value_1 THEN result_1 WHEN value_2 THEN result_2 [WHEN ] ELSE result_n END; PostgreSQL CASE Statement Examples. How would be the right syntax for that CASE WHEN in the WHERE clause? Thank you! Oct 10, 2019 · Name an output column created with case in PostgreSQL. How can I use consecutive conditional clause in SQL? 0. Select query inside case in a postgresql function. Jul 1, 2015 · INSERT INTO MyTable (value1, value2) SELECT t. PostgreSQL query, LIKE operator. asked Jan 6, 2023 at 2:49. Postgres custom function with CASE. CASE WHEN with WHERE. status = 'Approved' THEN 'Review' ELSE EXCLUDED. Apr 3, 2019 · Introduction to PostgreSQL CASE. 1,726 3 3 gold badges 37 37 silver badges 72 72 bronze badges. empid = c. Using CASE in PostgreSQL to SELECT different FROMs. Hot Network Questions Nov 21, 2019 · The difference is Filter vs. postgres CASE and where Jan 6, 2015 · PostgreSQL , CASE WHEN. 0 query case when postgresql. If a condition evaluates to true, the CASE expression returns the corresponding result that follows the condition. g. Apr 25, 2014 · PostgreSQL use case when result in where clause. PostgreSQL: Case with Jan 27, 2023 · 4. adding condition when case statement is true in postgresql. 在本文中，我们将介绍如何在PostgreSQL的CASE WHEN语句中使用SELECT语句。PostgreSQL是一种高级关系型数据库管理系统，它提供了许多强大的功能，使我们可以更灵活地处理数据。 PostgreSQL 函数：CASE WHEN和IF ELSE的区别. new_book := 1000; else new. status = 'active' and (four. Viewed 131k times 56 . naam AS varchar) FROM spelers s; SELECT s. I am doing it to only scan the partition 'U' in case the variable ${mp_id} is in (1,2,3) or only scan partition 'E' of the table, if the variable ${mp_id} is in (4,5,6) etc. The CASE statement, one of PostgreSQL's features, enables conditional logic and data manipulation in SQL queries. 文字を日付に変換する、書式を設定する【PostgreSQL】 6. 在本文中，我们将介绍在 PostgreSQL 中如何使用嵌套的 IF 和 CASE 查询。这些查询可以帮助我们根据条件执行不同的操作和返回不同的结果。 阅读更多：PostgreSQL 教程. empid ) SELECT enumber, bday, empid, pay AS current_pay FROM cte WHERE rn = 1 ; Dec 28, 2018 · SIMILAR TO is part of the SQL standard, but it is very odd syntax, and the only reason PostgreSQL supports it, is to stay standard compliant. If no WHEN condition is true then the value of the case expression is the result in the ELSE clause. 4. SELECT id, name, case when complex_with_subqueries_and_multiple_when END AS d FROM table t WHERE d IS NOT NULL LIMIT 100, OFFSET 100; Sep 16, 2022 · Put a SELECT in front of the CASE statement. 3 A fragment from a bigger query which updates a JSONB field in a different table (I don't think the JSONB stuff has any relevance to the question however): CASE WHEN EXISTS(SELECT r Feb 22, 2024 · Known for its scalability, and extensibility, PostgreSQL is a potent open-source relational database management system. Aug 17, 2015 · As the PostgreSQL documentation states:. A CASE expression does not evaluate any subexpressions that are not needed to determine the result. Robert Robert. name IN ('MyName') THEN 1 ELSE 2 END AS value2 FROM MyTable; If you're trying to change existing rows, you need an update query, e. That CASE WHEN in the WHERE is wrong. May 19, 2021 · PostgreSQL에서 조건에 따라 다른값을 보여주는 CASE WHEN ~ END 구문에 대해 알아보자. See full list on geeksforgeeks. Aug 29, 2017 · PostgreSQL use case when result in where clause. Modified 10 years, 9 months ago. For examples we will be using the sample database (ie, dvdrental). Case in where clause with column Like condition. 5. 日付の加算、週の加算、月の加算【PostgreSQL】 8. Jul 8, 2013 · how can update table in with case by postgresql. ニーズがこれらの条件式の機能を超える場合は、より表現力豊かなプログラミング言語でサーバー側関数を記述することを検討してください。 PostgreSQL：Sum(Case when) 导致选择结果多行的解决方法 在本文中，我们将介绍在使用 PostgreSQL 数据库时，当使用 Sum(Case when) 语句时，可能会导致选择结果出现多行的情况，并提供相应的解决方法。 在 PostgreSQL 数据库中，Sum(Case when) 语句常用于对数据进行分类汇总。 Sep 9, 2024 · Often in PostgreSQL you may want to use a COUNT DISTINCT statement with a CASE WHEN statement to count the number of distinct rows that meet some condition. Jun 28, 2019 · PostgreSQL , CASE WHEN. Ask Question Asked 10 years, 9 months ago. column type automatically Oct 25, 2022 · SELECT CAST(s. 99 then 1 else 0 end ) as "cc" from film; 结果： aa bb cc 341 323 336 【注 Jun 1, 2021 · adding condition when case statement is true in postgresql. See syntax, examples, and comparison with other functions such as COALESCE, NULLIF, GREATEST and LEAST. Viewed 3k times 1 . May 22, 2014 · I am using PostgreSQL and currently I have something like this: SELECT MAX(CASE WHEN SUBSTRING(article_code,5,1) IN ('9') THEN 1 ELSE 0 END) AS has9, MAX(CASE WHEN SUBSTRING(article_code,5, Apr 12, 2022 · @baudot the value is obtained at run time; but to be able to run, the sql engine has to know which tables it will be using before running the query; and the way you want it to work, would require the query to execute for the first table, get all rows, and then go throught all of them running another query for each row. SQL SELECT CASE WHEN SUM. PostgreSQL : Use of ANY for PostgreSQL：在CASE WHEN语句中使用SELECT语句. 在本文中，我们将介绍PostgreSQL数据库中的两种条件语句：CASE WHEN和IF ELSE，以及它们之间的区别。在编写数据库操作时，条件语句是非常重要的，它们允许我们根据不同的条件执行不同的操作。 阅读更多：PostgreSQL 教程. Each WHEN clause can then specifically handle matching one of those values. price * 0. CASE WHEN statement example in SQL query. phone_id from the sequential scan (even if that branch is never executed), so the filter will be applies to all 10000 result rows. nama_kios, jenis_kios AS jenis, CASE WHEN jenis_kios = 'makanan' THEN 5 WHEN jenis_kios = 'mainan' THEN 6 WHEN jenis_kios = 'pakaian' THEN 6 WHEN jenis_kios = 'sepatu' THEN 7 WHEN jenis_kios = 'buku' THEN 8 WHEN jenis_kios Aug 8, 2018 · PostgreSQL: Case with conditions based on two columns. You can use the following syntax to do so: SELECT COUNT (DISTINCT CASE WHEN team='Mavs' THEN points END ) AS mavs_points FROM athletes; Mar 10, 2014 · postgresql case when date and sorting by date. PostgreSQL 使用CASE WHEN在选择查询中. select * from table order by (case when (true) then id else 1/0 end) desc -- works select * from table order by (case when (select true) then id else 1/0 end) desc -- exception select * from table order by (case when (1=1) then id else 1/0 end) desc -- works select * from table order by (case when (select 1=1) then id else 1/0 May 31, 2021 · PostgreSQL CASE statement. Multiple conditions in case expression in postgres. Abaixo serão descritos 3 exemplos da Nov 24, 2016 · query case when postgresql. CASEWHEN in WHERE clause in Postgresql. CASE 表达式的基本语法如下： 总结. status END; Nov 25, 2013 · PostgreSQL, CASE WHEN and IF. bday, c. NULLIF 9. You're telling postgres on the one hand that the type should be an integer (since you will return empid itself, in some cases), but on the other hand, you're saying that the type is a string ('red', 'blue', etc). bedrag) IS NOT NULL THEN ROUND(avg(b. The example above can be written using the simple CASE syntax: SELECT a, CASE a WHEN 1 THEN 'one' WHEN 2 THEN 'two' ELSE 'other' END FROM test; a | case ---+----- 1 | one 2 | two 3 | other. Dec 8, 2021 · PostgreSQL, CASE WHEN and IF. Postgresql case and testing boolean fields. lldapid end as useid, lobjectid from security s left join users u on s. Nov 21, 2024 · 9. SQL count different cases and return a table. id left join usergroups g on s. Add a comment | 2 Answers Apr 9, 2018 · PostgreSQL, CASE WHEN and IF. 18. One-Time Filter. Postgres CASE WHEN IN query CASE…WHEN语句在WHERE子句中的灵活应用. Viewed 18k times 3 . gildhqxtzmryxuuphabrnkqibcnoycmrsvqltmhmirkrr