1. Case Expression 可以用在SQL和PL/SQL中,关于Case Expression最重要的一点就是,这个Case语句最后是返回一个值的,不管是在SQL语句的Select, Order By, Where 字句中,归根结底每个Case Expression都是要返回一个值。 而且,用法上面,Case Expression 的结束标志是END, 不是END CASE!这点很重要,经常搞混淆了! -...
Writingcaseexpressions directly in SQL statements is fine for one-off logic. Often you’ll want to reuse this logic in many queries. Copy-pasting it into every statement is error-prone and hard to maintain. You can avoid these problems by moving the logic into the table definition withvirtual...
In this example, if the deptno column has a 10 in it, the SQL query will return the value accounting rather than the number 10. If the deptno is not 10, 20, 30, or 40, then the CASE statement will fall through to the ELSE clause, which will return unassigned. Note that with a s...
SQL> select from dba_role_privs; SQL> select from dba_sys_privs; SQL> select * from role_sys_privs; 查自己拥有哪些系统权限 SQL> select * from session_privs; 删除用户 SQL> drop user 用户名 cascade; //加上cascade则将用户连同其创建的东西全部删除 系统权限传递:增加WITH ADMIN OPTION选项,则...
This Oracle tutorial explains how to use the Oracle / PLSQL CASE statement with syntax and examples. 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
UPDATE tab1 SET budgpost_gr1= CASE WHEN (budgpost in ('1001','1012','50055'...
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+...
下面来总计下之前的随笔中所说过的所有的SELECT子句的顺序。 子句 说明 是否必须使用 SELECT...
4 convert-sql-statement ConvertSQLReport<n>.XML 5 synchronize-target TargetSynchronizationReport<n>.XML 6 refresh-from-database SourceDBRefreshReport<n>.XML 重要 輸出報表與評量報表不同。 前者是已執行命令效能的報表,而後者則是供程式設計取用的 XML 報表。 如需輸出報表的命令選項 (從上述 Sl 第 2...
SELECT a.c_tenantid, a.c_tacode, c_tradeacco, CASE CONCAT(CONCAT(CONCAT('F6' ,a.c_agencyno),c_taflag),a.c_businflag) WHEN '66003153' THEN ' ' ELSE c_cityno END c_cityno, a.c_fundcode, a.d_requestdate, d_requesttime, a.c_businflag, ...