Access Code - DELETE Statement with DISTINCTROW and T-SQL Access Now() vs. T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a lar...
/* 含义: 当条件search_condition1成立时,执行statement_list1, 当条件search_condition2成立时,执行statement_list2, 否则就执行 statement_list */ CASE WHEN search_condition1 THEN statement_list1 [WHEN search_condition2 THEN statement_list2] ... [ELSE statement_list] END CASE;...
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ELSE子句中的语...
用于判断条件是否为真。如果 condition 为真，则执行相应的 statement(s)。如果 condition 为假，则跳过...
在MySQL中,可以将IF语句放在CASE表达式中来实现条件判断和返回不同的结果。具体的语法如下: 代码语言:txt 复制 CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE result END 其中,condition1、condition2等是条件表达式,result1、result2等是对应条件的结果。ELSE子句是可选的,用于指定...
IF condition THEN statement; END IF; 1. 2. (2) IF...ELSE...结构语法结构: IF condition THEN statements ; ELSE statements; END IF; 1. 2. 3. (3)IF...ELIF...结构 IF condition THEN statements; ELIF condition2 THEN statements; .....
除了上述形式外,CASE语句还有一种更加复杂的形式,可以使用多个WHEN子句和一个ELSE子句来实现更加复杂的逻辑。总结在实际开发中,我们需要根据具体情况选择不同的条件语句。如果只涉及简单的条件判断,IF语句或IF函数都可以胜任。如果涉及更加复杂的逻辑判断,CASE语句则更加灵活和强大。因此,在写SQL查询语句时,要充分理解...
If the condition in the IF block returns TRUE, then the SQL statement block after the IF statement is executed. If the condition returns FALSE, then the control executes the ELSE block if present, or else it exits the IF statement.
七、CONDITIONALFUNCTIONS IN HIVE Hive supports three types of conditional functions. These functions are listed below: IF( Test Condition, True Value, False Value ) The IF condition evaluates the “Test Condition” and if the “Test Condition” is true, then it returns the “True Value”. Oth...
2. CASE Expression: For inline conditional logic in SQL queries. Using IF in PL/pgSQL The IF statement in PL/pgSQL allows developers to execute conditional operations within a procedural block. Syntax: DO $$ BEGIN IF condition THEN