how to implement a complicated sql command

Question

I have a sql table in a MySQL with the following records:

+------+----------+
| user |   dob    |  
+------+----------+
| john | 1/10/96  | 
| jane | 3/4/97   |          


        

Answer 1

WIth the help of Delete with Join in MySQL

I made

DELETE FROM table_name a
    INNER JOIN (SELECT count(name) as dupesPostMillenia, name 
                FROM table_name 
                WHERE dob>'1/1/00' 
                GROUP BY name ) b on a.name=b.name
    WHERE a.dob < '1/1/00' and b.dupesPostMillenia=0

I think this might help.