我只是想从表中返回重复的记录。就我而言，如果多个记录在 col1、col2、col3 和 col4 中具有相同的值，则记录是重复的。
SELECT col1, col2, col3, col4
, COUNT(*) AS cnt
FROM yourTable
GROUP BY col1, col2, col3, col4
HAVING COUNT(*) > 1
如果您想显示其他列，您可以JOIN上表：
SELECT t.*
, dup.cnt
FROM yourTable t
JOIN
( SELECT col1, col2, col3, col4
, COUNT(*) AS cnt
FROM yourTable
GROUP BY col1, col2, col3, col4
HAVING COUNT(*) > 1
) AS dup
ON t.col1 = dup.col1
AND t.col2 = dup.col2
AND t.col3 = dup.col3
AND t.col4 = dup.col4
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