尝试首先选择最大
ID组
db_type，然后将其用作子查询
not in。
DELETe FROM MyTable WHERe ID NOT IN (SELECt ID FROM (SELECt MAX(ID) AS ID from MyTable GROUP BY DB Type) AS tb1 )
编辑：
DELETe FROM MyTable HAVINg MAX(ID) > ID;
尝试首先选择最大
ID组
db_type，然后将其用作子查询
not in。
DELETe FROM MyTable WHERe ID NOT IN (SELECt ID FROM (SELECt MAX(ID) AS ID from MyTable GROUP BY DB Type) AS tb1 )
编辑：
DELETe FROM MyTable HAVINg MAX(ID) > ID;
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