在Oracle中使用IF ELSE [英] Using IF ELSE in Oracle

问题描述

作为一名Web开发人员，我知道如何以多种语言使用IF ELSE.但是，我正在学习如何使用TOAD for Oracle编写报告.

As a web developer, I know how to use the IF ELSE in multiple languages. However, I am learning how to write reports using TOAD for Oracle.

我的问题是，如何正确添加IF ELSE语句?

My question is, how do I properly add an IF ELSE statement?

这就是我正在尝试做的. 错误是:命令未正确结束.

This is what I am attempting to do. The error is: Command not Properly Ended.

(VIKKIE to ICKY已由我的上级主管责成我，以帮助我学习)

(VIKKIE to ICKY has been tasked to me by my supervisor to help me learn)

SELECT DISTINCT a.item, b.salesman, NVL(a.manufacturer,'Not Set')Manufacturer

FROM inv_items a, arv_sales b
WHERE   a.co = '100'
      AND a.co = b.co
      AND A.ITEM_KEY = b.item_key   
--AND item IN ('BX4C', 'BX8C', 'BX866') --AND salesman ='15'
AND a.item LIKE 'BX%'
AND b.salesman in ('01','15')
AND trans_date BETWEEN to_date('010113','mmddrr')
                         and to_date('011713','mmddrr')


GROUP BY a.item, b.salesman, a.manufacturer
ORDER BY a.item

IF  b.salesman = 'VIKKIE' THEN
a.salesman := 'ICKY';
END IF; 

推荐答案

IF是PL/SQL构造.如果要执行查询，则说明您使用的是SQL，而不是PL/SQL.

IF is a PL/SQL construct. If you are executing a query, you are using SQL not PL/SQL.

在SQL中，您可以在查询本身中使用CASE语句

In SQL, you can use a CASE statement in the query itself

SELECT DISTINCT a.item, 
                (CASE WHEN b.salesman = 'VIKKIE'
                      THEN 'ICKY'
                      ELSE b.salesman
                  END), 
                NVL(a.manufacturer,'Not Set') Manufacturer
  FROM inv_items a, 
       arv_sales b
 WHERE  a.co = '100'
   AND a.co = b.co
   AND A.ITEM_KEY = b.item_key   
   AND a.item LIKE 'BX%'
   AND b.salesman in ('01','15')
   AND trans_date BETWEEN to_date('010113','mmddrr')
                      and to_date('011713','mmddrr')
ORDER BY a.item

由于您没有进行任何汇总，因此您不需要查询中的GROUP BY.您确定要使用DISTINCT吗?人们经常随意地添加它，或者在缺少连接条件时添加它，而不是考虑是否真的有必要做额外的工作来识别和删除重复项.

Since you aren't doing any aggregation, you don't want a GROUP BY in your query. Are you really sure that you need the DISTINCT? People often throw that in haphazardly or add it when they are missing a join condition rather than considering whether it is really necessary to do the extra work to identify and remove duplicates.

这篇关于在Oracle中使用IF ELSE的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！