BI SQL # 237 : SQL Server DBA Scripts : A. Compare Database

Hi Folks,

In this article we are going to cover 3 types of Comparing Database A. Compare Database.

In this post we are going to discuss following points:

• Problem Statement of SQL Script:
• Description of SQL Script:
• SQL Script Output Column
• Input Parameter of SQL Script
• SQL Script Code
• SQL Script Output Screenshot
• User Level to execute

Problem Statement of SQL Script:

Compare database.

Description of SQL Script:

This script compares the table schemas between two SQL Server databases and gives the report for missing columns , data type mismatch , length & precision mismatch and Collation Mismatch.

SQL Script Output Column

Input Parameter of SQL Script

@Sourcedb sysname ,@Destdb sysname ,@Tablename sysname

SQL Script Code

DECLARE @Sourcedb SYSNAME
DECLARE @Destdb SYSNAME
DECLARE @Tablename SYSNAME
DECLARE @SQL VARCHAR(max)

SELECT @Sourcedb = 'BenEngine'

SELECT @Destdb = 'BenEngine17Aug'

SELECT @Tablename = 'npsbenefitCode' --  '%' for all tables 

SELECT @SQL = 
    ' SELECT Tablename  = ISNULL(Source.tablename,Destination.tablename) 
                      ,ColumnName = ISNULL(Source.Columnname,

Destination.Columnname) 
                      ,Source.Datatype 
                      ,Source.Length 
                      ,Source.precision 
                      ,Destination.Datatype 
                      ,Destination.Length 
                      ,Destination.precision 
                      ,[Column]  = 
                       Case  
                       When Source.Columnname IS NULL then 

''Column Missing in the Source'' 
                       When Destination.Columnname IS NULL then 

''Column Missing in the Destination'' 
                       ELSE '''' 
                       end 
                      ,DataType = CASE WHEN Source.Columnname IS NOT NULL  
                                        AND Destination.Columnname IS NOT NULL  
                                        AND Source.Datatype <> Destination.

Datatype THEN ''Data Type mismatch''  
                                  END 
                      ,Length   = CASE WHEN Source.Columnname IS NOT NULL  
                                        AND Destination.Columnname IS NOT NULL  
                                        AND Source.Length <> Destination.

Length THEN ''Length mismatch''  
                                  END 
                      ,Precision = CASE WHEN Source.Columnname IS NOT NULL  
                                        AND Destination.Columnname IS NOT NULL 
                                        AND Source.precision <> Destination.

precision THEN ''precision mismatch'' 
                                    END 
                      ,Collation = CASE WHEN Source.Columnname IS NOT NULL  
                                        AND Destination.Columnname IS NOT NULL 
                                        AND ISNULL(Source.collation_name,'''') 

<> ISNULL(Destination.collation_name,'''') THEN ''Collation mismatch'' 
                                        END 
                        
   FROM  
 ( 
 SELECT Tablename  = so.name  
      , Columnname = sc.name 
      , DataType   = St.name 
      , Length     = Sc.max_length 
      , precision  = Sc.precision 
      , collation_name = Sc.collation_name 
  FROM ' 
    + @Sourcedb + '.SYS.objects So 
  JOIN ' + @Sourcedb + 
    '.SYS.columns Sc 
    ON So.object_id = Sc.object_id 
  JOIN ' 
    + @Sourcedb + 
    '.SYS.types St 
    ON Sc.system_type_id = St.system_type_id 
   AND Sc.user_type_id   = St.user_type_id 
 WHERE SO.TYPE =''U'' 
   AND SO.Name like ''' 
    + @Tablename + 
    ''' 
  ) Source 
 FULL OUTER JOIN 
 ( 
  SELECT Tablename  = so.name  
      , Columnname = sc.name 
      , DataType   = St.name 
      , Length     = Sc.max_length 
      , precision  = Sc.precision 
      , collation_name = Sc.collation_name 
  FROM ' 
    + @Destdb + '.SYS.objects So 
  JOIN ' + @Destdb + 
    '.SYS.columns Sc 
    ON So.object_id = Sc.object_id 
  JOIN ' 
    + @Destdb + 
    '.SYS.types St 
    ON Sc.system_type_id = St.system_type_id 
   AND Sc.user_type_id   = St.user_type_id 
WHERE SO.TYPE =''U'' 
  AND SO.Name like ''' 
    + @Tablename + 
    ''' 
 ) Destination  
 ON source.tablename = Destination.Tablename  
 AND source.Columnname = Destination.Columnname '

EXEC (@Sql)

SQL Script Output Screenshot

User Level to execute

200

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