常用函数
1、查询scn转换为时间戳
SELECT to_char(scn_to_timestamp(ora_rowscn),'yyyymmdd hh24miss'),txn_time FROM dwr_eda_cf_rep_gls
2、行转列,pivot
WITH WIP AS (SELECT SHIFT_TIMEKEY, PRODUCT_ID, GLS_ID, FACTORY FROM DWT_WIP_EOH_GLS WHERE SHIFT_TIMEKEY = '20190505 060000' AND FACTORY IN ('CF', 'CELL')) SELECT PRODUCT_ID,CF,CE FROM WIP PIVOT (COUNT(GLS_ID) FOR FACTORY IN('CF' AS CF, 'CELL' AS CE)) P; --1.FROM WIP 查询出需要的数据 --2.PIVOT 对查询结果做行转列生成新表P,会对GLS_ID、FACTORY列之外的列进行聚合
3、列转行,unpivot
SELECT * FROM P UNPIVOT(GLS_QTY FOR FACTORY IN(CF, CE))
4、多行合并为一条记录,WM_CONCAT
WITH TEST AS( SELECT 1 AS a,'a' AS b FROM dual UNION ALL SELECT 1 AS a,'b' AS b FROM dual UNION ALL SELECT 1 AS a,'c' AS b FROM dual UNION ALL SELECT 2 AS a,'a' AS b FROM dual UNION ALL SELECT 2 AS a,'d' AS b FROM dual ) SELECT a,to_char(WM_CONCAT(b)) AS WM FROM TEST GROUP BY a
仅作为笔记使用,记录信息过于简洁。