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SQL Scripts & Samples

Posted Aug 8, 2002

SQL Script for Comparing the Contents of Two Tables

By DatabaseJournal.com Staff


Here's some SQL code from Eli Leiba that will all you to compare two tables -- say, table A and table B -- to determine if their content is the same. Assuming that A and B have the same structure, here's how it works:

First, from set theory, recall that: If ((|A| = |B|) && |A U B| = |A|)) ====>>> A = B

|A| = NUMBER of rows in A
|B| = NUMBER of rows in B

Here's the SQL code (with T-SQL syntax, but can be adapted for other DBMS's):


declare @cnt1 int 
declare @cnt2 int 
declare @cnt3 int 
declare @res bit 

select @cnt1 = count(*) from A 
select @cnt2 = count(*) from B 
select @cnt3 = count('x') 
     from (select * from A 
     UNION 
     select * from B) as t 

if (@cnt1 = @cnt2) and (@cnt2 = @cnt3) 
 begin 
   set @res = 1 
   print 'A = B' 
 end 
 else 
  begin 
    set @res = 0 
    print 'A <> B' 
  end 
go 


» See All Articles by Columnist Eli Leiba




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