It executes the ELSE statement and prints the message for it. In this case, we have two SQL IF statements. The second IF statement evaluates to false, therefore, it executes corresponding ELSE statement 它执行ELSE语句并为其打印消息。 在这种情况下,我们有两个SQL IF语句。 第二条IF语句的计算结...
this statement is equivalent to nested IF...THEN...ELSE...IF...THEN statements, but only one END IF is needed. The following example uses an IF...THEN...ELSIF...ELSE statement to count the number of employees by compensation, in steps of $25,000. ...
使用临时表存储IN子句中的值列表,然后进行连接查询。 参考链接 SQL Server WHERE Clause SQL Server IN Operator SQL Server IF...ELSE Statement 通过以上信息,你应该能够更好地理解 SQL Server 中IF条件和WHERE子句中的IN运算符,并能够解决相关的性能问题。
2) PL/pgSQL if-then-else statement The if...then...else statement executes the statements in the if branch if the condition evaluates to true; otherwise, it executes the statements in the else branch. Here’s the syntax of the if...then...else statement: if condition then statements;...
{ sql_statement | statement_block }使用语句块定义的任何有效的Transact-SQL语句或语句分组。要定义语句块(批处理),请使用流语言关键字BEGIN和END 组合。尽管所有Transact-SQL语句在BEGIN…END块中都是有效的,但某些Transact-SQL语句不应在同一批(语句块)中组合在一起。 示例1: 1 2 3 4 IF DATENAME(weekday...
Each statement_list consists of one or more SQL statements; an empty statement_list is not permitted. An IF ... END IF block, like all other flow-control blocks used within stored programs, must be terminated with a semicolon, as shown in this example: ...
[ELSE statement_list] END CASE;案例根据传入的月份,判定月份所属的季节(要求采用case结构)。1-3月份,为第一季度 4-6月份,为第二季度 7-9月份,为第三季度 10-12月份,为第四季度create procedure p(in month int) begin declare result varchar(10); case when month >= 1 and month <= 3 then set...
When I execute it in the query analyzer I get: #1064 - 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 'If @DisplayVal = 1 Then Select "Success"' at line 1 This is with MySQL 5.5.32. For...
Each statement_list consists of one or more SQL statements; an empty statement_list is not permitted. An IF ... END IF block, like all other flow-control blocks used within stored programs, must be terminated with a semicolon, as shown in this example: ...
statement2; ... ELSE statement3; statement4; ... END IF; 1. 2. 3. 4. 5. 6. 7. 8. 9. 其中,condition是一个布尔表达式,如果为真(即非零),则执行statement1,statement2等等;如果为假(即零),则执行statement3,statement4等等。 值得注意的是,IF-ELSE语句必须以END IF;结束。