The Oracle/PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement. Syntax The syntax for the CASE statement in Oracle/PLSQL is: CASE [ expression ] WHEN condition_1 THEN result_1 WHEN condition...
WHEN SEARCH CONDIDTION 1 THEN STATEMENT 1; WHEN SEARCH CONDIDTION2 THEN STATEMENT 2; ... WHEN SEARCH CONDIDTIONN THEN STATEMENT N; ELSE STATEMENT N+1; END CASE; 当搜索条件的计算结果为TRUE时,执行控制权传递与之相关的语句。如果任何搜索条件都不会产生TRUE,则会执行与ELSE子句相关的语句。请注意...
2. Case Statement 只可以用在pl/sql中,不能用在SQL中,结束标志是END CASE!Case Statement 相当于一组IF…THEN…ELSE…END IF语句,不需要返回值,只是在条件匹配的时候执行某种操作而已,所以在每个WHEN…THEN之后需要有一个分号,表示一条执行语句! CASE {variable or expression} WHEN {value} THEN {one or mo...
If you need to use this logic in many tables you could place it in a PL/SQL function. Then call this function in your SQL: FromOracle Database 23ai, theautomatic SQL transpilercan extract SQL expressions in PL/SQL. These are then part of the SQL statement, so at runtime it's as-i...
Summary: in this tutorial, you will learn how to use the PL/SQL CASE statement to control the flow of a program. The CASE statement chooses one sequence of statements to execute out of many possible sequences. The CASE statement has two types: simple CASE statement and searched CASE stateme...
Oracle decode函数 decode函数在Oracle SQL查询语句中的使用非常广泛,也经常应用到PL/SQL语句块中。...可以作如下理解该表达式: 1,如果expr1 = expr2,decode函数返回expr3表达式的值; 2,如果expr1 !...= expr2,decode函数返回expr4表达式的值,如果expr4未指定,则返回null; 使用示例1: select decode(1,-1,...
问PL/SQL: ORA-00936:使用case和条件更新查询中缺少表达式ENSQL中的CASE WHEN使用 Case具有两种格式。简...
sql oracle plsql 我有两个表,HISTORY_DATA和CURRENT_DATA,我有一个输入参数REPORT_DATE,根据以下条件,我必须获取数据: IF(REPORT_DATE<=TRUNC(SYSDATE-40))THEN SCHD_TABLE:='HISTORY_DATA' ; ELSE SCHD_TABLE:='CURRENT_DATA'; END IF ; 我尝试使用动态SQL,但它给出的错误是无效的表名。 SELECT *...
如何使用 Oracle Case Statement 测试不等式问题描述 投票:0回答:3这很好用: select case (1+2) -- (or_some_more_complicated_formula_yielding_a_numeric_result) when 200 then '200' when 100 then '100' else 'other' end hi_med_low from dual ; 但我需要做更多这样的事情: select case (1+...
Packages that useCaseStatement.WhenThen PackageDescription oracle.javatools.db.sql Contains an API for declaratively parsing SQL queries (SELECT statements). Uses ofCaseStatement.WhenTheninoracle.javatools.db.sql Methods inoracle.javatools.db.sqlthat returnCaseStatement.WhenThen ...