标签：alt email 结果 count weight cts contact and div
SELECT id, firstName, lastName, email, COUNT(*) FROM contacts GROUP BY firstName HAVING COUNT(firstName) > 1;
结果是：其中count(*)是表示重复的次数。
SELECT id, firstName, lastName, email, COUNT(*) FROM contacts GROUP BY firstName, lastName, email HAVING COUNT(firstName) > 1 AND COUNT(lastName) > 1 AND COUNT(email) > 1;
结果：
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标签：alt email 结果 count weight cts contact and div
原文地址：https://www.cnblogs.com/yuezc/p/12851942.html
