小编Gav*_*vin的帖子

我很感激有关如何在 SQL 中检查一个列表中的元素是否也出现在另一个列表中的任何指示。

List A = Live Customers in April
List B = Live Customers in May

如何检查列表 A 中的哪些客户也出现在列表 B 中？识别丢失的客户

i.e. Customers in A but not in B.

感谢您的帮助。加夫

有没有办法在 CASE 语句中将 CAST 转换为 INTEGER ？

CASE 
WHEN SV.END_DATE IS NOT NULL THEN SV.END_DATE - SV.START_DATE 
ELSE 0
END AS DAYDIFF

如果当前CLUSTERn =上一个CLUSTERn，然后将上一个PRODCAT作为PREVCAT添加到当前行，那么我的case语句出了什么问题，我将不胜感激。

ORA-30484: missing window specification for this function
30484. 00000 -  "missing window specification for this function"
*Cause:    All window functions should be followed by window specification,
           like <function>(<argument list>) OVER (<window specification>)
*Action:
Error at Line: 11 Column: 30

SELECT  CLUSTERn,
        MEMBERn,
        COUNT(*) OVER ( PARTITION BY CLUSTERn ORDER BY MEMBERn, PRODCAT, STARTd, ENDd ) AS NEWRANK,
        CASE WHEN CLUSTERn = LAG(CLUSTERn) THEN LAG(PRODCAT) ELSE 'New' END AS PREVCAT,
        STATUS,
        PRODCAT,
        JOINTYPE,
        JOINRANK,
        CSP,
        PROGID,
        PROMNAME,
        PROMOID,
        COHORT, …