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...
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 condition1 THEN CASE WHEN nested_condition1 THEN nested_result1 WHEN nested_condition2 THEN nested_result2 ... ELSE nested_result END WHEN condition2 THEN result2 ... ELSE result END 复制代码 在WHEN子句中可以嵌套另一个CASE WHEN语句,以实现更复杂的条件逻辑。 CASE WHEN语句与聚合函数...
`CASE WHEN` 后面可以跟多个 `WHEN` 条件,最后的 `ELSE` 是可选的,用于处理未匹配到任何条件时的默认情况。 另外,`CASE WHEN` 也可以嵌套使用,用于处理更复杂的条件判断。例如: ```sql SELECT column1, column2, CASE WHEN condition1 THEN CASE WHEN nested_condition1 THEN result1 WHEN nested_condition...
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...
已解决: nested exception is java.sql.SQLDataException: ORA-01476: divisor is equal to zero 问题 oracle 除零异常,且sql重复语句过多 思路 使用decode 或者 NULLIF 解决除零异常问题 原SQL case when冗余 可以用 case when in 简化 解决 在这个修改后的SQL语句中,NULLIF函数用于处理zzje、zxjje和jxjje计算...
https://linuxhint.com/sql-case-statement/ This tutorial mainly focuses on building a nested case statement in conjunction with the WHEN clauses. Nested CASE WHEN Statements In SQL, we can use a set of nested CASE WHEN statements in SQL to evaluate the multiple conditions and return a differe...
WHEN'MD'THEN'Maryland' WHEN'UT'THEN'Utah' ENDASStateName FROMpubs.dbo.authors ORDERBYau_lname DECODE is considered the most powerful function in Oracle. Oracle 8i release introduced the CASE expression. The CASE expression can do all that DECODE does plus lot of other things including IF-THEN...
It’s also possible to start an entire new CASE expression on a THEN or ELSE argument. For example, this T-SQL statement has a nested CASE expression: SELECT [BusinessEntityID],[JobTitle],[BirthDate],CASE WHEN [JobTitle]LIKE'%Marketing%'THEN CASE WHEN [BirthDate]>='1984-01-01'THEN'...
[Error 10081]: UDTF's are not supported outside the SELECT clause, nor nested in expressions UDTF explode不能写在别的函数内如果你这么写,想查两个字段,select explode(split(area,',')) as area,good_id from explode_lateral_view; 会报错FAILED: SemanticException 1:40 Only a single expression ...