syntaxsql IFboolean_expression{sql_statement|statement_block} [ELSE{sql_statement|statement_block} ] 引數 boolean_expression 傳回 或FALSE的TRUE表達式。 如果布爾表達式包含SELECT語句,SELECT語句必須以括弧括住。 {sql_statement|statement_block} 使用語句區塊所定義的任何 Transact-SQL 語句或語句群組。 除非使...
Transact-SQL 語法慣例 語法 syntaxsql IFboolean_expression{sql_statement|statement_block} [ELSE{sql_statement|statement_block} ] 引數 boolean_expression 傳回 或FALSE的TRUE表達式。如果boolean_expression包含SELECT語句,SELECT語句必須以括弧括住。 {sql_statement|statement_block} ...
1.Switch case 做不了复杂的判断，这个是最常见的，比如c/c++里对字符串特征的判断。2.一开始就2.3...
句法(Syntax) In the following SQL IF Statement, it evaluates the expression, and if the condition is true, then it executes the statement mentioned in IF block otherwise statements within ELSE clause is executed. 在下面SQL IF语句中,它计算表达式,如果条件为true,则执行IF块中提到的语句,否则将执行...
像列 LIKE 字符串或者列 BETWEEN 值 1 AND 值 2这样的谓词需要指定 2 个以上的参数，而 EXIST 的...
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 报错是因为mysql的procedure里面if else语句里面, 用了begin end语句,去掉了就OK了. DELIMITER$$USE`sportgbmj`$$DROPPROCEDUREIFEXISTS`sp_web_addmiddayrank`$$CREAT...
Syntax If_Else_Statement := 'IF'Boolean_Expression'THEN'U-SQL_Statement[ 'ELSEIF'Boolean_Expression'THEN'U-SQL_Statement] [ 'ELSE'Boolean_Expression'THEN'U-SQL_Statement] 'END'. Remarks Boolean_Expression Is a constant-foldable expression that returns TRUE or FALSE. ...
syntaxsql IFboolean_expression{sql_statement|statement_block} [ELSE{sql_statement|statement_block} ] Arguments boolean_expression An expression that returnsTRUEorFALSE. If theboolean_expressioncontains aSELECTstatement, theSELECTstatement must be enclosed in parentheses. ...
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 报错是因为mysql的procedure里面if else语句里面, 用了begin end语句,去掉了就OK了. DELIMITER $$ USE `sportgbmj`$$ ...
This SQL Server tutorial explains how to use the IF...ELSE statement in SQL Server (Transact-SQL) with syntax and examples. In SQL Server, the IF...ELSE statement is used to execute code when a condition is TRUE, or execute different code if the conditio