zoukankan      html  css  js  c++  java
  • 【sql】关联查询+表自关联查询

    表:

    经销商 dealer   字段 uid  parent_uid  name  

    联系人 contact  字段 uid  dealer_id  contact_main

    需求:

    想要查询到经销商的信息,和本经销商的主要联系人的信息 ,和本经销商的父级经销商的name

    情况:

    可能有parent_id是null

    sql语句:

        SELECT
            dea.uid uid,
            dea.enabled_flag enabledFlag,
            dea.delete_flag deleteFlag,
            dea.tenement_id tenementId,
            dea.parent_id parentId,
            pd.name parentName,
            dea.name name,
            dea.type type,
            dea.bar_code barCode,
            dea.outer_code outerCode,
            dea.outer_id outerId,
            dea.mne_code  mneCode,
            dea.address address,
            dea.address_xy addressXy,
            dea.business_area businessArea,
            dea.business_area_xy businessAreaXy,
            con.name  contactName,
            con.mobile mobile
        FROM
            dealer AS dea
        LEFT JOIN  (select * from contact where tenement_id = '9f63f84f-52c6-4c8e-b3c3-66b9f1f283ba' and main_contact = 1) con ON dea.uid = con.dealer_id
    
        LEFT JOIN  dealer pd on pd.uid = dea.parent_id
  • 相关阅读:
    2017ICPC南宁补题
    H. The Game of Life
    I
    Twice Equation
    (贪心+队列)String
    Marcin and Training Camp
    莫比乌斯函数模版
    HDU-1695 莫比乌斯反演
    Steps to One DP+莫比乌斯反演
    Educational Codeforces Round 62 (Rated for Div. 2)
  • 原文地址:https://www.cnblogs.com/sxdcgaq8080/p/9205462.html
Copyright © 2011-2022 走看看