導讀:1建站知識有這樣一個需求：需要查詢出某個客戶某一年那些天是有連續辦理過業務,本文給予sql實現語句并測試，感興趣的朋友網站推廣優化seo網站建設制作。

需求說明： 需要查詢出某個客戶某一年那些天是有連續辦理過業務 實現SQL如下： 創建表：

復制代碼 代碼如下:

create table test_num (tyear number, tdate date);

測試數據： insert into test_num select 2014,trunc(sysdate)-1 from dual union all select 2014,trunc(sysdate)-002 from dual union all select 2014,trunc(sysdate)-003 from dual union all select 2014,trunc(sysdate)-004 from dual union all select 2014,trunc(sysdate)-005 from dual union all select 2014,trunc(sysdate)-007 from dual union all select 2014,trunc(sysdate)-008 from dual union all select 2014,trunc(sysdate)-009 from dual union all select 2013,trunc(sysdate)-120 from dual union all select 2013,trunc(sysdate)-121 from dual union all select 2013,trunc(sysdate)-122 from dual union all select 2013,trunc(sysdate)-124 from dual union all select 2013,trunc(sysdate)-125 from dual union all select 2013,trunc(sysdate)-127 from dual union all select 2015,trunc(sysdate)-099 from dual union all select 2015,trunc(sysdate)-100 from du網站建設al union all select 2015,trunc(sysdate)-101 from dual union all select 2015,trunc(sysdate)-102 from dual union all select 2015,trunc(sysdate)-104 from dual union all select 2015,trunc(sysdate)-105 from dual; 寫SQL:

復制代碼 代碼如下:

SELECT TYEAR, MIN(TDATE) AS STARTDATE, MAX(TDATE), COUNT(TYEAR) AS ENDNUM FROM (SELECT A.*, A.TDATE - ROWNUM AS GNUM FROM (SELECT * FROM TEST_NUM ORDER BY TYEAR, TDATE) A) GRO網站建設哪家好UP BY TYEAR, G百度seo網站優化NUM ORDER BY TYEAR, MIN(TDATE)

相關網站推廣優化seo網站建設制作。

關鍵詞標簽: 標簽 案例 SQL