MySQL的SQL语句写法，除了那些基本的之外，还有一些也算比较常用的，这里记录下来，以便以后查找。 好记性不如烂笔头，这话说的太有道理了，一段时间不写它，还真容易忘记。大家不要纠结这些SQL语句包含的业务或是其它问题，本文只是一篇笔记而已。
将数据从T1表导入到T2表
INSERT INTO T2 (C1,C2) SELECT C1,C2 FROM T1 [WHERE C1 = XX AND C2 = XX ORDER BY C1]
使用T2表的NAME来更新T1表的NAME
UPDATE T1 AS A, T2 AS B SET A.NAME = B.NAME WHERE A.TID = B.ID
两表的关联更新
UPDATE T_ROLE_USER AS A, ( SELECT ID FROM T_USER WHERE DEPARTID IN ( SELECT ID FROM T_DEPART WHERE LENGTH(ORG_CODE) = 9 ) ) AS B SET A.ROLEID = '123456' WHERE A.USERID = B.ID
自己和自己关联更新
UPDATE T_DEPART AS A, ( SELECT ID, SUBSTRING(ORG_CODE, 1, 6) ORG_CODE FROM T_DEPART WHERE LENGTH(ORG_CODE) = 8 AND PARENT_DEPART_ID IS NOT NULL ) AS B SET A.PARENT_DEPART_ID = B.ID WHERE SUBSTRING(A.ORG_CODE, 1, 6) = B.ORG_CODE
两表关联删除，将删除两表中有关联ID并且T2表NAME为空的两表记录
DELETE A,B FROM T1 AS A LEFT JOIN T2 AS B ON A.TID = B.ID WHERE B.NAME IS NULL
将统计结果插入到表
INSERT INTO SE_STAT_ORG ( RECORD_DATE, ORG_ID, ORG_NAME, SIGN_CONT_COUNT, SIGN_ARRI_CONT_COUNT, SIGN_CONT_MONEY, SIGN_ARRI_CONT_MONEY, TOTAL_ARRI_CONT_COUNT, TOTAL_ARRI_MONEY, PUBLISH_TOTAL_COUNT, PROJECT_COUNT ) SELECT * FROM ( SELECT '2012-06-09' RECORD_DATE, PARENT_ORG_ID, PARENT_ORG_NAME, SUM(SIGN_CONT_COUNT) SIGN_CONT_COUNT, SUM(SIGN_ARRI_CONT_COUNT) SIGN_ARRI_CONT_COUNT, SUM(SIGN_CONT_MONEY) SIGN_CONT_MONEY, SUM(SIGN_ARRI_CONT_MONEY) SIGN_ARRI_CONT_MONEY, SUM(TOTAL_ARRI_CONT_COUNT) TOTAL_ARRI_CONT_COUNT, SUM(TOTAL_ARRI_MONEY) TOTAL_ARRI_MONEY, SUM(PUBLISH_TOTAL_COUNT) PUBLISH_TOTAL_COUNT, SUM(PROJECT_COUNT) PROJECT_COUNT, FROM SE_STAT_USER WHERE DATE_FORMAT(RECORD_DATE, '%Y-%m-%d') = '2012-06-09' GROUP BY PARENT_ORG_ID ) M
三表关联更新
UPDATE SE_STAT_USER A, ( SELECT USER_ID, SUM(INVEST_ORG_COUNT + FINANCIAL_ORG_COUNT + INTERMEDIARY_ORG_COUNT + ENTERPRISE_COUNT) AS COMMON_COUNT FROM SE_STAT_USER WHERE DATE_FORMAT(RECORD_DATE, '%Y-%m-%d') = '2012-06-09' GROUP BY USER_ID ) B, ( SELECT USER_ID, SUM(ESTABLISH_COUNT + STOCK_COUNT + MERGER_COUNT + ACHIEVE_COUNT) AS PROJECT_COUNT FROM SE_STAT_USER WHERE DATE_FORMAT(RECORD_DATE, '%Y-%m-%d') = '2012-06-09' GROUP BY USER_ID ) C SET A.COMMON_COUNT = B.COMMON_COUNT, A.PROJECT_COUNT = C.PROJECT_COUNT WHERE A.USER_ID = B.USER_ID AND A.USER_ID = C.USER_ID AND DATE_FORMAT(A.RECORD_DATE, '%Y-%m-%d') = '2012-06-09'
带条件的关联更新
UPDATE SE_STAT_USER A, ( SELECT P.CHANNEL, COUNT(P.CONT_ID) AS CONT_COUNT, C.CUST_MGR_ID FROM ( SELECT CHANNEL, CONT_ID FROM SK_PROJECT WHERE PROJECT_STATUS = 6 AND DATE_FORMAT(AUDIT_TIME, '%Y-%m-%d') = '2012-06-11' ) p INNER JOIN SE_CONTRACT C ON P.CONT_ID = C.CONT_ID GROUP BY P.CHANNEL, C.CUST_MGR_ID ) B SET A.STOCK_COUNT = CASE WHEN B.CHANNEL = 2 THEN B.CONT_COUNT ELSE 0 END, A.ESTABLISH_COUNT = CASE WHEN B.CHANNEL = 3 THEN B.CONT_COUNT ELSE 0 END, A.ACHIEVE_COUNT = CASE WHEN B.CHANNEL = 4 THEN B.CONT_COUNT ELSE 0 END, A.BRAND_COUNT = CASE WHEN B.CHANNEL = 5 THEN B.CONT_COUNT ELSE 0 END, A.MERGER_COUNT = CASE WHEN B.CHANNEL = 6 THEN B.CONT_COUNT ELSE 0 END WHERE A.USER_ID = B.CUST_MGR_ID AND DATE_FORMAT(A.RECORD_DATE, '%Y-%m-%d') = '2012-06-11'
加索引
ALTER TABLE PROJECT ADD INDEX INDEX_USER_ID (USER_ID), ADD INDEX INDEX_PROJECT_STATUS (PROJECT_STATUS);
删除列
ALTER TABLE PROJECT DROP COLUMN PROJECT_STATUS, DROP COLUMN EXPECT_RETURN,DROP COLUMN CURRENCY;
增加列
ALTER TABLE PROJECT ADD COLUMN DICT_ID INT DEFAULT NULL COMMENT 'xxx' AFTER PROJECT_SITE, ADD COLUMN INTRODUCE TEXT DEFAULT NULL COMMENT 'xx' AFTER DICT_ID, ADD COLUMN STAGE INT DEFAULT NULL COMMENT 'xx' AFTER ID, ADD COLUMN ATTACH_URI VARCHAR(8) DEFAULT NULL COMMENT 'xxx' AFTER INTRODUCE;
修改列，一般用MODIFY修改数据类型，CHANGE修改列名
ALTER TABLE PROJECT CHANGE DICT_ID DICT_ID1 INT NOT NULL, MODIFY PROJECT_STATUS TINYINT NOT NULL COMMENT 'xxx';
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