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If group_concat does not return a value, is there any solution?
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GROUP_CONCAT using the CASE statement can produce multiple outputs.
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Why does the order change after mysql uses group_concat?
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mysql - 有张订单表,假设有个2个手机号,每个手机号都有5个订单,如何用一个sql实现每个手机号随机取3个订单?
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thinkphp - PHP5.2 pdo sqlite 不支持group_concat
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