General PostgreSQL CASE expression The following illustrates the general form of the CASE statement: CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 [WHEN ...] [ELSE else_result] END In this syntax, each condition (condition_1, condition_2…) is a boolean expression that...
the column must be present in theSELECTstatement of your query, on which you are specifying the boolean expressions (inCASE). But when you are usingCASEin pair with a where clause
when>=70 and age <=100 then 2 else 9 end as "年龄" from user where mobile="53437569"; 1. 2. 3. 4. 5. 6. 7. 查询结果如下: 忽然看到一篇讲解也很不错的文章,附链接:https://codedefault.com/2018/mysql-database-if-in-select-statement-choose-output-value-based-on-column-values 作者...
为了避免再次重复表达式，只需从查询结果中选择即可。例如：
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为了避免再次重复表达式，只需从查询结果中选择即可。例如：
在SQL中,CASE WHEN语句用于实现条件判断和分支逻辑。如果你希望缩短一个CASE WHEN语句,可以考虑以下几点: 1. 使用简洁的条件表达式:CASE WHEN语句中的条件表达式可以使用更...
In what instances is the case when statement with max used in MySQL? To complete the task of converting data orientation from vertical to horizontal. Take a look at this vertical data: FRUIT --- apple orange pear If we write this: SELECT...
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CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ... WHEN condition_n THEN statements_n [ ELSE else_statements ] END CASE;] Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) The searched CASE statement follows the rules below: The conditions in the WHEN...