mysql多字段内容并到单字段中的操作

 set @rn=0; 
 SELECT
     @rn:=@rn+1 序号,
     ryxm `人员姓名`,
     cylb `成员类别`,
    gzdw `工作单位`,
     zc `职称`,
     GROUP_CONCAT(zzqmc) AS `著作权名称`--多字段合并到一起
 FROM
     (SELECT
         VCA.ryxm ryxm,
         VCA.cylb cylb,
         VCA.gzdw gzdw,
         VCA.zc zc,
         VC.zzqmc zzqmc
 
     FROM V_COPYRIGHT AS VC ,V_COPYRIGHT_AUTHOR AS VCA  
     WHERE VC.id=VCA.zzqid)d
 GROUP BY ryxm,cylb,gzdw,zc

统计合并列中的个数

DROP FUNCTioN GetTextCount //
 

CREATE FUNCTION GetTextCount(pSourceText  VARCHAR(255),  pDivChar  CHAR(1))
RETURNS TINYINT
BEGIN
    -- 预期结果. 
    DECLARE vResult TINYINT;
    -- 当前逗号的位置.
    DECLARE vIndex INT;
    -- 前一个逗号的位置.
    DECLARE vPrevIndex INT;
 
    -- 结果的初始值.
    SET vResult = 1;
 
    -- 查询第一个 逗号的位置.
    SET vIndex = INSTR(pSourceText, pDivChar);
    IF vIndex = 0 THEN
        -- 参数中没有逗号，直接返回.
        RETURN vResult;
    END IF;
 
    -- 初始化情况，前一个逗号不存在.
    SET vPrevIndex = 0;
 
    -- 循环处理。
    WHILE vIndex > 0 DO
        -- 结果递增.
        SET vResult = vResult + 1;    
        -- 前一个逗号的位置 = 当前逗号的位置
        SET vPrevIndex = vIndex;
        -- 查询下一个逗号的位置.
        SET vIndex = LOCATE(pDivChar,  pSourceText,  vPrevIndex + 1);
    END WHILE;
 
    -- 返回结果.
    RETURN vResult;
END;

-- 查询结果.
SELECT
GetTextCount(zzqmc,",")
FROM perso

CREATE FUNCTION GetTextValue(pSourceText  VARCHAR(255),  pDivChar  CHAR(1), pIndex  TINYINT)
RETURNS VARCHAR(255) 
BEGIN
    -- 预期结果. 
    DECLARE vResult VARCHAR(255);
 
    IF pIndex = 1 THEN
        SELECT SUBSTRING_INDEX(pSourceText,  pDivChar,  1)  INTO  vResult;
    ELSE
        SELECT 
            REPLACE(
                SUBSTRING_INDEX(pSourceText,  pDivChar,  pIndex),
                CONCAT(SUBSTRING_INDEX(pSourceText,  pDivChar,  pIndex - 1) , pDivChar),
                "") INTO  vResult;
    END IF;
     
    -- 返回.
    RETURN vResult;
END;

SELECT
    GetTextValue(t.name, ",", MaxNum.No) AS `名称`,
    COUNT(*) AS `个数`
FROM
    person t,
    (SELECT 1 No UNION ALL
     SELECT 2 No UNION ALL
     SELECT 3 No UNION ALL
     SELECT 4 No UNION ALL
     SELECT 5 No ) MaxNum
WHERE
    GetTextCount(t.name, ",") >= MaxNum.No
GROUP BY
    GetTextValue(t.name, ",", MaxNum.No);