常用的MySQL语句写法

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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