The IF ELSE statement controls the flow of execution in SQL Server. It can be used in stored-procedures, functions, triggers, etc. to execute the SQL statements based on the specified conditions. Syntax: Copy IF Boolean_expression { sql_statement | statement_block } [ ELSE { sql_statement...
This SQL Server tutorial explains how to use theIF...ELSE statementin SQL Server (Transact-SQL) with syntax and examples. Description In SQL Server, the IF...ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE. Sy...
指定Transact-SQL 语句的执行条件。 如果满足条件,则执行后跟IF关键字及其条件的 Transact-SQL 语句:布尔表达式返回TRUE。 可选ELSE关键字引入了另一个 Transact-SQL 语句,该IF语句在条件不满足时执行:布尔表达式返回FALSE。 Transact-SQL 语法约定 语法 syntaxsql ...
ageif(age<18){printf("You need to be over 18 years old to continue\n");}elseif(age<21){printf("You need to be over 21\n");}else{printf("You are over 18 and older than 21 so you can continue \n");}} Output Run the code and check its output − ...
比如 这样编写的SQL语句,如果第一个id为null的话,SQL在后台运行出来的样子是这样的, SELECT * FROM text where and name ='1' 1. 查询起来 SELECT * FROM text where and name ='1' [Err] 1064 - You have an error in your SQL syntax;
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。 使用語句區塊所定義的任何有效 Transact-SQL 語句或語句群組。 若...
IF/ELSE Syntax Error Posted by:a a Date: August 30, 2008 06:55PM Whats wrong in this small procedure? Script line: 4 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 'end if;...
Transact-SQL 语法约定 语法 syntaxsql IFboolean_expression{sql_statement|statement_block} [ELSE{sql_statement|statement_block} ] 参数 boolean_expression 返回TRUE或FALSE.如果boolean_expression包含语句SELECT,则必须SELECT将语句括在括号中。 { sql_statement | statement_block } ...
if-else Syntax in C: The basic syntax of the “if-else” statement is as follows: if (condition) { // Code block executed if the condition is true } else { // Code block executed if the condition is false } Mechanism of if-else statement in C Initiated by the “if” keyword, th...
问sql if exists简单语法错误EN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...