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 syntax; 3. ...
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...
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 '( case when '0' =='2' and (select identification = '1' f' at line 1 ### The error may exist in file [...
-- 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 ...
[mysql]> helpcaseoperator; #case的第二种基本用法24Name: 'CASE OPERATOR'25Description:26Syntax:27CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN28result ...] [ELSE result] END2930CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...]31[ELSE result] ...
case_when case when then where Postgres - Case - When Doctrine - CASE WHEN CASE WHEN from嵌套CASE WHEN无子查询? Case when with else for每个'When‘条件 Mysql SELECT CASE WHEN然后返回字段 js的case when Case When SQL to LINQ 页面内容是否对你有帮助?
SQL CASE Syntax 1 2 3 4 5 CASEcase_value WHENwhen_valueTHENstatement_list [WHENwhen_valueTHENstatement_list] ... [ELSEstatement_list] ENDCASE CASE 搜索条件 1 2 3 4 5 6 7 SELECTOrderID, Quantity, CASE WHENQuantity > 30THEN"The quantity is greater than 30"...
CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE result END 相关优势 灵活性:可以在 SQL 查询中嵌入复杂的逻辑判断,而不需要编写额外的程序代码。 性能:相对于子查询或临时表,CASE WHEN通常具有更好的性能。 可读性:通过CASE WHEN可以使 SQL 查询更加直观和易读。
SQL CONVERT() CASE 關鍵字 (SQL CASE Keyword) CASE 類似於程式語言裡的 if/then/else 語句,用來作邏輯判斷。 CASE 語法 (SQL CASE Syntax) CASE WHEN condition THEN result [WHEN···] [ELSE result] END; 或是: CASE expression WHEN value THEN result [WHEN···] [ELSE result] END; ...
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 ...