查询条目的使用量

Question

我正在使用Oracle数据库和Oracle SQL Developer 4

我正在寻找一种方法来查明我是否已在多个表中使用了ID，而这些表是我加入了一个联合的。这应该是一个名为HAS_BEEN_USED的列，如果在其中一个表中使用过一次或多次，则值为“Yes”，如果未在任何表中使用，则为“No”。

如果ID在任何表中出现一次：HAS_BEEN_USED = YES

如果不是：HAS_BEEN_USED = NO

像这样的东西：

SELECT PRICETITLEID, IF(PRICETITLEID>0, 'Yes', 'No') AS HAS_BEEN_USED FROM ZZPRICETITLE
UNION
SELECT PRICETITLEID, IF(COUNT(PRICETITLEID)>0, 'Yes', 'No') AS HAS_BEEN_USED FROM ZZEXTVALUATIONRULE
UNION
SELECT PRICETITLEID, IF(COUNT(PRICETITLEID)>0, 'Yes', 'No') AS HAS_BEEN_USED FROM ZZMARKET
UNION
SELECT PRICETITLEID, IF(COUNT(PRICETITLEID)>0, 'Yes', 'No') AS HAS_BEEN_USED FROM ZZMARKETUSE
UNION
SELECT PRICETITLEID, IF(COUNT(PRICETITLEID)>0, 'Yes', 'No') AS HAS_BEEN_USED FROM ZZPRICE
WHERE TIMECREATED >= '01-FEB-17' 
GROUP BY PRICETITLEID;

评论任何问题

谢谢

Answer 1

试试这个

SELECT PRICETITLEID, CASE WHEN PRICETITLEID>0 THEN "Yes" ELSE "No" END AS HAS_BEEN_USED FROM ZZPRICETITLE
UNION
SELECT PRICETITLEID, CASE WHEN COUNT(PRICETITLEID)>0 THEN "Yes" ELSE "No" END AS HAS_BEEN_USED FROM ZZEXTVALUATIONRULE
UNION
SELECT PRICETITLEID, CASE WHEN COUNT(PRICETITLEID)>0 THEN 'Yes' ELSE 'No' END AS HAS_BEEN_USED FROM ZZMARKET
UNION
SELECT PRICETITLEID, CASE WHEN COUNT(PRICETITLEID)>0 THEN 'Yes' ELSE 'No' END AS HAS_BEEN_USED FROM ZZMARKETUSE
UNION
SELECT PRICETITLEID, CASE WHEN COUNT(PRICETITLEID)>0 THEN 'Yes' ELSE 'No' END AS HAS_BEEN_USED FROM ZZPRICE
WHERE TIMECREATED >= '01-FEB-17' 
GROUP BY PRICETITLEID;