今天,写存储过程时写成了:if...then...else if....else...end if.能编译通过,但是有问题,后来实在是找不到问题怀疑写错了这个语句,后来在网上查了一下,结果不是else if 而是elsif.改过来后就正常了。 Oracle/PLSQL: IF-THEN-ELSE Statement There are three different syntaxes
In this example, because the film id 100 exists in the film table the found variable is true. Therefore, the statement in the else branch is executed. 3) PL/pgSQL if-then-elsif Statement Unlike the if and if...then...else statements that evaluate only one condition, the if then elsif...
IF...THEN...ELSE statements specify an alternative set of statements that should be executed if the condition evaluates to FALSE. In the following example, the previous example is modified so that an IF...THEN...ELSE statement is used to display the textNon-commissionif an employee does not...
ELSE 语句 END IF; IF...THEN...ELSE 语句指定一组备用的语句,这些语句将在条件求值为 FALSE 时执行。以下示例对上一个示例作了修改,以便使用 IF...THEN...ELSE 语句在雇员没有佣金时显示文本“Non-commission”。 DECLARE v_empno emp.empno%TYPE; v_comm emp.comm%TYPE; CURSOR emp_cursor IS SELECT ...
ELSE {...statements...} END IF; Here is an example of a function that uses the IF-THEN-ELSE statement: CREATE OR REPLACE Function IncomeLevel ( name_in IN varchar2 ) RETURN varchar2 IS monthly_value number(6); ILevel varchar2(20); ...
.. When布尔表达式n then 结果表达式n [else 结果表达式n+1] END 3、while 语法结构 while 逻辑表达式 begin T-SQL语句组 [break]——无条件终止整个循环语句,即跳出循环 [continue]——结束本次循环,回到while处再判断是否重新开始下一次循环 end 4、return返回语句 作用:在批处理、语句块或存储过程中,使用...
When the IF THEN statement has no ELSE clause and the condition is not met, PL/SQL does nothing instead raising an error. Simple CASE statement example The following example compares single value (c_grade) with many possible values ‘A’, ‘B’,’C’,’D’, and ‘F’: DECLARE c_...
问在PL/PGSQL存储过程的声明部分中使用'Case‘或'If’语句EN所有在块里使用的变量都必须在块的声明段...
3.LOOPS of PL/SQL 3.1 LOOP for LOOP, it is often used with EXIT ,CONTINUE ,which is just like "break" and "continue" in C for a loop. the grammar is like below: [ <> ]LOOPstatementsENDLOOP[label]; example is: LOOP-- some computationsEXITWHENcount >100; CONTINUEWHEN...
存储过程出现 SQL statement ignored错误是：存储过程语句错误，字段或变量名可能拼错，导致存储过程无法执行。解决方法：仔细检查存储过程里的变量，字段，语句等是否正确。PL/SQL的特点：1、PL/SQL是一种块结构语言，一个PL/SQL程序就是一个块，块中可以嵌套子块,能够使一组SQL语句的功能更具模块化程序...