when后面既不是表达式,也不是值 selectname,salary,casesalarywhen>=2000then'T1'when>=3000then'T2'when>=4000then'T3'when>=5000then'T4'else'T5'endassalary_levelfromstaff ;-- ERROR 1064 (42000): You have an error in your SQL
1topics: #CASE的两种基本用法2CASE OPERATOR3CASE STATEMENT45MariaDB [mysql]> helpcasestatement; #case的第一种用法6Name: 'CASE STATEMENT'7Description:8Syntax:9CASE case_value10WHEN when_value THEN statement_list11[WHEN when_value THEN statement_list] ...12[ELSE statement_list]13END CASE1415Or...
-- ERROR 1064 (42000): You have an error in your SQL syntax; 3. 使用 CASE [col_name] WHEN [expr1] THEN [result1]… ELSE [default] END 如下语句不报错,但是结果不符合期望: when后面是表达式,不管when的条件是否满足,都是返回else里的结果 select name, salary, case salary when salary=2500 ...
PostgreSQL CASE WHEN: Conditional Logic in Queries< The CASE WHEN expression in PostgreSQL provides conditional logic within SQL queries. This guide covers syntax, usage examples, and practical applications. What is CASE WHEN in PostgreSQL? The CASE WHEN expression is used to implement conditional log...
SQL CASE Syntax SELECTcolumn1, column2,... ,CASEWHENconditionTHENresultENDASalias_nameFROMtable; Here, column1,column2,...are the column names to be included in the result set CASEchecks thecondition resultis the result or value to be inserted to the new column ifconditionis satisfied ...
WHEN Quantity = 30 THEN "The quantity is 30" ELSE "The quantity is under 30" END FROM OrderDetails; CASE分组条件1 2 3 4 5 6 7 SELECT CustomerName, City, Country FROM Customers ORDER BY (CASE WHEN City IS NULL THEN Country ELSE City END);好...
但是运行的时候报错了:ERROR: invalid input syntax for type numeric:'优秀' 百度说:数据类型不符。 仔细想一下, 60是int,优秀是string,确实类型不符。 sql修改如下: select case when score < 60 then '' || 60 else '优秀' end ...
SQL中的CASE WHEN使用 Case具有两种格式。简单Case函数和Case搜索函数。 –简单Case函数 CASE sex WHEN ...
...UPDATE salary SET sex = IF(sex = 'm', 'f', 'm') 也可以利用条件语句,在搜索的时候,直接进行数据转换 select *,(CASE WHEN sex='1'...参考资料: 1、Mysql if case总结 2、Leetcode swap salary 3、select case when if 的一些用法 4、IF Syntax...
我正在使用 SQL Server 2008 R2。 我想要对表中的记录进行基于优先级的排序。 所以我在 ORDER BY 子句中使用 CASE WHEN 语句。 ORDER BY 子句如下: {代码...} 但它给出了 Incorrect syntax near the keyword 'de...