sql case statement
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...
The SQLCASEstatement evaluates a list of conditions and adds a column with values based on the condition. For example, -- add a new column 'order_volume' in the Orders table-- and flag any order greater than 10000 as 'Large Order'-- and smaller than 10000 as 'Small Order'SELECT*,CASE...
The simple CASE statement has the following structure: CASE selector WHEN selector_value_1 THEN statements_1 WHEN selector_value_1 THEN statement_2 ... ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE ...
SQL: CASE Statement 1.CASE 写法如下: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 WHEN conditionN THEN resultN ELSE result END; 解释:1)先匹配第一条,不匹配的话继续第二条,如此循环,
CASE语句只返回第一个符合条件的值,剩下的部分将会被自动忽略。 The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement). So, once a condition is true, it will stop reading and return the result. If no conditions are tr...
NOTE: SQL commands are not case sensitive. The above SELECT statement can also be written as"select first_name from students_details;" You can also retrieve data from more than one column. For example, to select first name and last name of all the students. ...
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SQL语句尚未结束(SQL_STATEMENT_NOT_YET_COMPLETE) 类08 - 连接异常 08000 连接异常(CONNECTION_EXCEPTION) 08003 连接不存在(CONNECTION_DOES_NOT_EXIST) 08006 连接失败(CONNECTION_FAILURE) 08001 SQL客户端不能建立SQL连接(SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION) 08004 SQL服务器拒绝建立SQL连接(SQLSERVER_REJ...
搜索型 CASE 语句使用一个或多个布尔表达式来确定所要执行的语句。 语法 CASEWHENboolean-expressionTHENstatementsELSEstatementsEND CASE 描述 CASE 此关键字引入 CASE 语句中的第一个 WHEN 子句。 WHEN 布尔表达式 指定一个表达式,当控制流进入定义此表达式的 WHEN 子句时,将对此表达式进行求值。 如果 布尔表达式 ...