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 these examples, we decide as per the conditions. For example, if I get a bonus then only I will go for an international vacation else I will go for domestic vacations. We need to incorporate these conditions-based decisions in programming logic as well. SQL Server provides the capability...
IF...THEN...ELSE...END IF The syntax of this statement is: IF boolean-expression THEN statements ELSE statements END IF; 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 ...
通过查看清单10,您可以知道为什么IIF函数被认为是CASE表达式的一个简化版本。CASE被“IIF(”字符串替换;“THEN”子句被替换为一个逗号;“ELSE”子句用逗号替换;“END”被替换为“)”。 当布尔表达式“OrderAmt > 200”值为TRUE时,显示的值为“High $ Order。当布尔表达式‘OrderAmt > 200”被求出来的值为FALSE...
当条件被评估为TRUE时,IF-THEN-ELSE控制结构允许有条件地执行语句列表。 此控制结构仅适用于匿名块。 如果此结构用作独立命令,则会导致语法错误(“匿名块外部的命令无效”)。 下面的代码段演示了匿名块中IF-THEN-ELSE条件语句的正确格式。 IF booleanExpression THEN List of statements; ELSEIF booleanExpression TH...
syntaxsql העתק IF boolean_expression { sql_statement | statement_block } [ ELSE { sql_statement | statement_block } ] Argumentsboolean_expressionAn expression that returns TRUE or FALSE. If the boolean_expression contains a SELECT statement, the SELECT statement must be enclosed in ...
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...
{ pos -= 1; sf->stats_folds += 1; if (left > 0) { left -= 1; } continue; } else if (syntax_merge_words(sf, &sf->tokenvec[left], &sf->tokenvec[left+1])) { pos -= 1; sf->stats_folds += 1; if (left > 0) { left -= 1; } continue; } else if ( ;f && (...
可以看到,既然分组的逻辑是一种if else形式的,我们可不可以在mysql里找到这种逻辑的关键字呢?显然是有的,那便是 case语句。以下是其官方文档: Syntax: CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result ...] [ELSE result] END 或者 CASE WHEN [condition] THEN result [WHE...
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. ...