Mysql 如何得到这三个计数的总和（）？

我的问题是：

SELECT (SELECT COUNT(`id`) FROM `table1` WHERE `id` = '1') AS `count1`,
(SELECT COUNT(`id`) FROM `table2` WHERE `id` = '1') AS `count2`,
(SELECT COUNT(`id`) FROM `table3` WHERE `id` = '1') AS `count3`

如何计算计数1、计数2、计数3之和

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在上面的查询中，有什么方法可以做到吗？

当然。只需将这些值相加：

SELECT (SELECT COUNT(`id`) FROM `table1` WHERE `id` = '1') +
       (SELECT COUNT(`id`) FROM `table2` WHERE `id` = '1') +
       (SELECT COUNT(`id`) FROM `table3` WHERE `id` = '1') AS `sum` ...

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当然。只需将这些值相加：

SELECT (SELECT COUNT(`id`) FROM `table1` WHERE `id` = '1') +
       (SELECT COUNT(`id`) FROM `table2` WHERE `id` = '1') +
       (SELECT COUNT(`id`) FROM `table3` WHERE `id` = '1') AS `sum` ...

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嗯，很好。非常感谢，安德鲁！嗯，很好。非常感谢，安德鲁！