mysql每日一題0728---連續多天資料彙總統計
阿新 • • 發佈:2021-07-28
- 測試資料
CREATE TABLE T0728 ( val VARCHAR(50) ); insert into T0728 (val) values('A10000003'); insert into T0728 (val) values('A10000001'); insert into T0728 (val) values('A10000002'); insert into T0728 (val) values('A10000011'); insert into T0728 (val) values('A10000004'); insert into T0728 (val) values('A10000006'); insert into T0728 (val) values('A10000009'); insert into T0728 (val) values('A10000010'); insert into T0728 (val) values('A10000012');
- solution
WITH TEMP AS ( SELECT ROW_NUMBER() OVER ( ORDER BY VAL ) ID, SUBSTR( VAL, 2, 9 ) AS VAL FROM T0728 ) ---- 臨時表,新增自增列 SELECT GROUP_CONCAT( A ) RESULT --- 分組連線全部行顯示 FROM ( SELECT CONCAT( CONCAT( 'A', MIN ), '', CASE WHEN MAX = MIN THEN '' ELSE CONCAT( '-A', MAX ) END ) A --- 連線不同連續的資料中的最大值與最小值,補全A FROM ( SELECT A.VAL - A.ID, MIN( VAL ) MIN, MAX( VAL ) MAX FROM TEMP A GROUP BY 1 ) A -- 根據自增列與val值之間的差值是否一致判斷是否歸為連續 ) B