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這是有點艱難，我猜。mysql concat子查詢結果作爲一個子查詢本身
我想要實現的是通過group_concat生成一個字符串，然後將其作爲查詢運行。我的查詢返回 numCustomers作爲查詢我想運行。
是否有可能在主查詢中將其作爲查詢運行？
我的查詢如下：
SELECT
lastSent,tblmailinglistgroups.addDate,title, tblmailinglistgroups.active, tblmailinglistgroups.id,groupType,
CASE
WHEN (groupType='s') THEN (SELECT COUNT(id) FROM tblmailinglistgroupscusts WHERE groupID=tblmailinglistgroups.id)
WHEN (groupType='d') THEN (
CONCAT('SELECT COUNT(tblcustomers.id) FROM tblcustomers INNER JOIN tblcustomersextension ON tblcustomers.id=tblcustomersextension.customerID WHERE 1=1 ',
(SELECT GROUP_CONCAT(filterAndOr,' ',openBrackets,' ',filterBy, ' ',(
SELECT
CASE
WHEN filterOperator='ne' THEN '!=' WHEN filterOperator='e' THEN '=' WHEN filterOperator='be' THEN '>=' WHEN filterOperator='se' THEN '<=' WHEN filterOperator='b' THEN '>' WHEN filterOperator='s' THEN '<' WHEN filterOperator='in' THEN 'in' WHEN filterOperator='ni' THEN 'not in' WHEN 'nu' THEN 'IS NULL'
END AS operator),' \'',filterValue,'\' ',closeBrackets SEPARATOR ' ') AS x
FROM `tblmailinglistgroupsrules1`
WHERE groupID=tblmailinglistgroups.id
)
)
) END AS numCustomers
FROM
tblmailinglistgroups
LEFT JOIN tblmailinglistgroupscusts ON (tblmailinglistgroupscusts.groupID = tblmailinglistgroups.id)
GROUP BY tblmailinglistgroups.id
ORDER BY tblmailinglistgroups.id DESC
表structes是：
CREATE TABLE IF NOT EXISTS `tblmailinglistgroups` (
`id` bigint(12) NOT NULL AUTO_INCREMENT,
`title` varchar(100) NOT NULL DEFAULT '',
`addDate` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`active` enum('on','off') NOT NULL DEFAULT 'on',
`lastSent` date NOT NULL DEFAULT '0000-00-00',
`groupType` enum('s','d') NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=67 ;
CREATE TABLE IF NOT EXISTS `tblmailinglistgroupscusts` (
`id` bigint(12) NOT NULL AUTO_INCREMENT,
`groupID` bigint(12) NOT NULL DEFAULT '0',
`custID` int(5) NOT NULL,
`email` varchar(200) NOT NULL DEFAULT '',
`phone` varchar(20) NOT NULL,
`comments` varchar(250) NOT NULL,
`addDate` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`id`),
KEY `groupID` (`groupID`),
KEY `custID` (`custID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=7813 ;
CREATE TABLE IF NOT EXISTS `tblmailinglistgroupsrules1` (
`id` int(5) NOT NULL AUTO_INCREMENT,
`groupID` int(5) NOT NULL,
`filterAndOr` enum('AND','OR') NOT NULL,
`openBrackets` enum('','(','((','(((','((((') NOT NULL,
`filterBy` varchar(40) NOT NULL,
`filterOperator` varchar(40) NOT NULL,
`filterValue` varchar(40) NOT NULL,
`closeBrackets` enum('',')','))',')))','))))') NOT NULL,
`showOrder` int(5) NOT NULL,
`addDate` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=415 ;