-- 三個表:USERS(ID)
-- USER_USERGROUP(GROUPID USERID)
-- USERGROUP(GROUPID)
-- USERS表與USERGROUP表通過USER_USERGROUP表實現關聯,並有外鍵約束。
-- 刪除USERS與USERGROUP中任一表裏的記錄,都需要先把USER_USERGROUP表裏相關
-- 信息刪除。
-- **************************************************************************************************************
--管理員用戶信息
SELECT * FROM USERS WHERE NAME = 'system';
SELECT * FROM USER_USERGROUP WHERE USERID = '1';
SELECT * FROM USERGROUP WHERE GROUPID = '100';
--===USERS表
SELECT * FROM USERS; --只剩東莞信息。
--東莞信息。查找存在USERS表中在USER_USERGROUP表有記錄的記錄,共1790條記錄。
SELECT * FROM USERS
WHERE ID IN
(SELECT USERID FROM USER_USERGROUP
WHERE GROUPID = '100'
OR GROUPID = '117'
OR (GROUPID >= '272' AND GROUPID <= '306'));
--非東莞信息。查找存在USERS表中在USER_USERGROUP表沒有記錄的記錄。與上一SQL語句結果相反。
SELECT * FROM USERS
WHERE ID NOT IN
(SELECT USERID FROM USER_USERGROUP
WHERE GROUPID = '100'
OR GROUPID = '117'
OR (GROUPID >= '272' AND GROUPID <= '306'));
--刪除非東莞信息
DELETE FROM USERS
WHERE ID NOT IN
(SELECT USERID FROM USER_USERGROUP
WHERE GROUPID = '100'
OR GROUPID = '117'
OR (GROUPID >= '272' AND GROUPID <= '306'));
--===USER_USERGROUP表
SELECT * FROM USER_USERGROUP; --只剩東莞信息
--東莞信息,1790條記錄
SELECT * FROM USER_USERGROUP
WHERE GROUPID = '100'
OR GROUPID = '117'
OR (GROUPID >= '272' AND GROUPID <= '306');
--非東莞信息,上一SQL語句結果集取反。
SELECT * FROM USER_USERGROUP
WHERE GROUPID <> '100'
AND GROUPID <> '117'
AND (GROUPID < '272' OR GROUPID > '306');
--刪除非東莞信息
DELETE FROM USER_USERGROUP
WHERE GROUPID <> '100'
AND GROUPID <> '117'
AND (GROUPID < '272' OR GROUPID > '306');
--===USERGROUP表,37條記錄。
SELECT * FROM USERGROUP; --只剩下東莞
--東莞信息
SELECT * FROM USERGROUP
WHERE GROUPID = '100'
OR GROUPDESC LIKE '%東莞%';
--非東莞信息,上一SQL語句結果集取反。
SELECT * FROM USERGROUP
WHERE GROUPID <> '100'
AND GROUPDESC NOT LIKE '%東莞%';
--刪除非東莞信息
DELETE FROM USERGROUP
WHERE GROUPID <> '100'
AND GROUPDESC NOT LIKE '%東莞%';