从 MYSQL 数据透视表 table 过滤记录

Question

我是使用动态查询构建的。需要知道如何从中过滤记录。我需要将此查询的结果视为 table。让我们说 CustomUser table。所以我需要像下面解释的那样查询这个table。

SET @Colvalues = NULL;
SET @sql = NULL;

SELECT
  GROUP_CONCAT(DISTINCT CONCAT('MAX(IF(f.fieldName = ''',
      f.fieldName, ''', COALESCE(v.fieldValue, f.defaultValue) , NULL)) AS ', '''', f.fieldName , '''')
  ) INTO @Colvalues
FROM customField AS f
INNER JOIN Customvalue AS v ON f.Id = v.customFieldId;


SET @sql = CONCAT('SELECT 
    u.*, v.relatedId, v.CreatedAt, ', @Colvalues , '
FROM customField AS f
INNER JOIN Customvalue AS v ON f.Id = v.customFieldId RIGHT JOIN User u on u.id = v.relatedId
GROUP BY   v.relatedId, v.CreatedAt;');

PREPARE stmt 
FROM @sql;

EXECUTE stmt;

这个结果有以下数据，

现在将其视为 CustomUser table，我需要运行像

这样的查询

select * from CustomUser where HOMEEMAIL like '%ab%' and JOINDATE like '%2010%' and SCHOOLING? like '%1%'

或

select * from CustomUser where HOMEEMAIL like '%ab%' and JOINDATE like '%2010%' and SCHOOLING? like '%1%' and LANDPHONENO? like '%0112%'

Answer 1

您可以用子查询包装它并进行任何您需要的过滤：

SET @Colvalues = NULL;
SET @sql = NULL;

SELECT
  GROUP_CONCAT(DISTINCT CONCAT('MAX(IF(f.fieldName = ''',
      f.fieldName, ''', COALESCE(v.fieldValue, f.defaultValue) , NULL)) AS ', '''', f.fieldName , '''')
  ) INTO @Colvalues
FROM customField AS f
INNER JOIN Customvalue AS v ON f.Id = v.customFieldId;


SET @sql = CONCAT('SELECT * FROM (SELECT 
    u.*, v.relatedId, v.CreatedAt, ', @Colvalues , '
FROM customField AS f
INNER JOIN Customvalue AS v ON f.Id = v.customFieldId RIGHT JOIN User u on u.id = v.relatedId
GROUP BY   v.relatedId, v.CreatedAt)
AS s WHERE s.Homeemail = 456;');   -- here

PREPARE stmt 
FROM @sql;

EXECUTE stmt;

SqlFiddleDemo

您还可以将条件提取到第二个变量并连接：

SET @conditions = NULL;
SET @conditions = CASE WHEN @conditions IS NULL THEN '1 = 1' ELSE @conditions END

SET @sql = CONCAT('SELECT * FROM (SELECT 
        u.*, v.relatedId, v.CreatedAt, ', @Colvalues , '
    FROM customField AS f
    INNER JOIN Customvalue AS v ON f.Id = v.customFieldId RIGHT JOIN User u on u.id = v.relatedId
    GROUP BY   v.relatedId, v.CreatedAt)
    AS s WHERE ',  @conditions);   -- here

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