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BernardMe
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求助: sql 结果集 两个表的同名字段 能否合并为一行

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  •   BernardMe · Nov 3, 2018 · 2460 views
    This topic created in 2748 days ago, the information mentioned may be changed or developed.

    求助:sql 结果集 两个表的同名字段 能否合并为一行

    -- 根据人员所在区域查出该部门的所有考勤设备
    
    SELECT
    	dbi.id, dbi.`NAME`, dbi.LOCATION_ID, dai.ALGORITHM_VERSION, dgi.ALGORITHM_VERSION, dai.DOMAIN_ID
    FROM
    	DEVICE_BASIC_INFO dbi
    LEFT JOIN device_attendance_info dai on dbi.ID = dai.DEVICE_ID
    LEFT JOIN device_gatemachine_info dgi on dbi.ID = dgi.DEVICE_ID
    WHERE
    	1 = 1
    AND dbi.IS_USED != 2
    AND dbi.LOCATION_ID = 349
    AND (dbi.DEVICE_TYPE = 1 OR dbi.DEVICE_TYPE = 14)
    ;
    

    |id | name | dep | a.ver | b.ver | domain | |------ | ------ | ------ |------ |------ |------ | |366 |GMReader|349 | - |v3.3.1 | - | |427 |KQ_01 |349 |5.8 | - |322 |

    请大侠指教,谢谢

    1 replies    2018-11-03 23:25:17 +08:00
    TommyLemon
        1
    TommyLemon  
       Nov 3, 2018
    合并为一行是什么意思?一起查出来(数据库支持,但 JSON 不支持,得 AS 取别名) 还是合并为一个字段( CONCAT(a, b) )?
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