在这个例子中,CASE WHEN语句根据订单金额的不同范围返回不同的等级。你可以根据实际需求添加更多的条件。 如果有多个字段需要根据条件进行计算,也可以嵌套CASE WHEN语句,形成复杂的条件逻辑。例如: SELECT column1, column2, CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN nested_result1 WHEN nested_...
CASE WHEN 语句可以嵌套使用,以处理更复杂的条件逻辑。嵌套 CASE WHEN 的语法如下: sql SELECT column1, CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN nested_result1 WHEN nested_condition2 THEN nested_result2 ELSE nested_default_result END WHEN condition2 THEN result2 ELSE default_result...
搜索CASE WHEN语句: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE result END 复制代码 根据条件进行匹配,如果满足condition1,则返回result1;如果满足condition2,则返回result2;否则返回result。 嵌套CASE WHEN语句: CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN nes...
这种用法是根据列的值来判断条件,并返回对应的结果。 搜索CASE WHEN语句: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE result END 复制代码 这种用法是根据条件进行判断,并返回对应的结果。 嵌套CASE WHEN语句: CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN nest...
CASE WHEN语句是一种在SQL查询中使用的条件表达式,用于根据条件返回不同的结果。在同一行返回结果的情况下,可以通过以下几种方式改进CASE WHEN语句: 1. 使用嵌套CASE WHEN语...
嵌套CASE语句可以在WHEN或ELSE后面再嵌套一个CASE语句,用于处理更复杂的条件逻辑。例如: 代码语言:txt 复制 CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN nested_result1 WHEN nested_condition2 THEN nested_result2 ... ELSE nested_resultN END WHEN condition2 THEN result2 ... ELSE resultN...
嵌套CASE WHEN语句的基本语法结构如下: CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN nested_result1 WHEN nested_condition2 THEN nested_result2 ... ELSE nested_resultN END WHEN condition2 THEN result2 ... ELSE resultNEND 在这个结构中,外部的CASE WHEN语句根据外部条件返回一个值,而内...
Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.sql.ast.expr.SQLCaseExpr@d6ad16e2; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: Yo...
•Case When语句可以进行嵌套,实现更复杂的条件判断 示例: SELECTcolumn_name, CASEWHENcolumn_name='value1'THEN'Match 1' WHENcolumn_name='value2'THEN CASEWHENother_column='value3'THEN'Nested Match' ELSE'Nested No Match' END ELSE'No Match' ENDASmatch_status FROMtable_name; 9. •Case When是...
(select identification = '1' f' at line 1 ; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '( case when '0' =='2' and...