= TARGET_RESULTS || 'ON B.ID = C.PROJECTID AND C.YEAR_DATE = D.TIME) T ORDER BY ID,PROJECTNAME,TIME )C ON A.ID = C.ID AND B.TIME = C.TIME ORDER BY a.ID,b.TIME'; TARGET_RESULTS := TARGET_RESULTS || ') ' || ALIAS || ' '; --循环拼接关联SQL FOR TEMP IN DATA ...
IF...THEN...ELSIF...ELSE statements provide the means for checking many alternatives in one statement. Formally, 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 stat...
Second, IF statement condition is FALSE, it does not print the message inside IF statement block 其次,IF语句条件为FALSE,它不会在IF语句块内打印消息 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 t...
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 过程中的 IF 语句 可使用 IF 语句来根据条件满足状态而有条件进入某个逻辑。IF 语句在逻辑上等价于带有搜索式 CASE 语句 WHEN 子句的 CASE 语句。 IF 语句支持使用可选 ELSE IF 子句和缺省 ELSE 子句。END IF 子句是指示语句结尾所必需的。 以下是包含 IF 语句的过程的示例:...
mybatis的动态sql-if和sql片段 foreach的使用 当查询条件有多个的时候,可以使用动态sql 例如像这种需求: SELECT * FROM USER WHERE id=#{id} and sex=#{sex} 的时候,当传入id的值为空时,用这种方式写sql语句就有问题 这时候就应该用动态sql 上面的statement可以写成这样...
If a givensearch_conditionevaluates to true, the correspondingTHENorELSEIFclausestatement_listexecutes. If nosearch_conditionmatches, theELSEclausestatement_listexecutes. Eachstatement_listconsists of one or more SQL statements; an emptystatement_listis not permitted. ...
{ 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: ...
Oracle数据库支持使用“IF - ELSE”进行简单的分支判断,语法结构和MSSQL Server的语法类似: IF { condition_1 } THEN { PL-SQL blocks A } ELSE { PL-SQL blocks B } END IF; 1. 2. 3. 4. 5. 条件语句放在 IF 和 THEN 之间,条件语句成立时执行语句块A,否则执行语句块B。在 IF ...