Programmabilities Blog

2007-08-30

SQL compare two tables

Difference in data stored in both tables (compare the difference between two tables)? You can use SQL to see rows which don't have a match in one table or the other:

Select col_a,col_b from table1 
where not exists 
    (select * from table2 
     where table1.col_a = table2.col_a and 
           table1.col_b = table2.col_b)

Repeat for table2.

further notes: --http://windowsitpro.com/Articles/ArticleID/14368/14368.html?Ad=1
--http://webmasterworld.com/databases_sql_mysql/3241540.htm

Labels: sql