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 for these types of statemen...
Syntax #1: IF-THEN IF condition THEN {...statements...} END IF; Syntax #2: IF-THEN-ELSE IF condition THEN {...statements...} ELSE {...statements...} END IF; Syntax #3: IF-THEN-ELSIF IF condition THEN {...statements...} ELSIF condition THEN {...statements...} ELSE {...st...
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...
The Transact-SQL statement (sql_statement) following the boolean_expression is executed if the boolean_expression evaluates to TRUE. The optional ELSE keyword is an alternate Transact-SQL statement that is executed when boolean_expression evaluates to FALSE or NULL. Transact-SQL syntax conventions ...
Spark SQL 官方文档中SQL Syntax一节对Grouping Sets语句的描述如下: Groups the rows for each grouping set specified after GROUPING SETS. (... 一些举例) This clause is a shorthand for aUNION ALLwhere each leg of theUNION ALLoperator performs aggregation of each grouping set specified in theGROUPIN...
{ 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 && (...
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...
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...