An easy way to compare all tables’ DDL between two SQL environments

To continue my story about data warehouse migration from UAT to PROD environment.

The DDL difference between the same source loading table from two environemnts will cause my data warehouse load fail, so I need to find an easy to compare the two for all my sourcing tables . There are a lot of good tools with free trail out there to choose. However, there are some regulation from my client side to installing third party tool so I need to create a query to help me to do so instead.

Inspired by an answer from this Post which compares one table. I generated the following query which can loop through all of my targeted sourcing tables.

DECLARE @Table VARCHAR(100);

DECLARE @i int=1;
While @i<= (select max([RANKColumn]) from [dbo].[EvaluationTableList] ) — this is the list table which contains all the tables you want to validate

Begin

SET @Table=(select [TABLENAME] from [dbo].[EvaluationTableList] where [RANKColumn]=@i)

insert into [dbo].[EnviromentObjectDifference] — (this is the output table)
SELECT Table1.ServerName,
Table1.DBName,
Table1.SchemaName,
Table1.TableName,
Table1.ColumnName,
Table1.name DataType,
Table1.Length,
Table1.Precision,
Table1.Scale,
Table1.Is_Identity,
Table1.Is_Nullable,
Table2.ServerName as T2ServerName,
Table2.DBName as T2DBName,
Table2.SchemaName as T2SchemaName,
Table2.TableName as T2TableName,
Table2.ColumnName as T2ColumnName,
Table2.name as T2DataType,
Table2.Length as T2Length,
Table2.Precision as T2Precision,
Table2.Scale as T2Scale,
Table2.Is_Identity as T2Is_Identity,
Table2.Is_Nullable as T2Is_Nullable
FROM
(SELECT @Server1 ServerName,
@DB1 DbName,
SCHEMA_NAME(t.schema_id) SchemaName,
t.Name TableName,
c.Name ColumnName,
st.Name,
c.Max_Length Length,
c.Precision,
c.Scale,
c.Is_Identity,
c.Is_Nullable
FROM [ServerName01].[DatabaseNameO1].sys.tables t
INNER JOIN [ServerName01].[DatabaseNameO1].sys.columns c ON t.Object_ID = c.Object_ID
INNER JOIN sys.types st ON St.system_type_id = c.System_Type_id AND st.user_type_id = c.user_type_id
WHERE t.Name =@Table) Table1
FULL OUTER JOIN
(SELECT @Server2 ServerName,
@DB2 DbName,
SCHEMA_NAME(t.schema_id) SchemaName,
t.name TableName,
c.name ColumnName,
st.Name,
c.max_length Length,
c.Precision,
c.Scale,
c.Is_Identity,
c.Is_Nullable
FROM [ServerName02].[DatabaseNameO2].sys.tables t
INNER JOIN [ServerName02].[DatabaseNameO2].sys.columns c
ON t.Object_ID = c.Object_ID
INNER JOIN sys.types st
ON St.system_type_id = c.System_Type_id
AND st.user_type_id = c.user_type_id
WHERE t.Name = @Table) Table2
ON Table1.ColumnName = Table2.ColumnName
where Table1.ColumnName is null or Table2.ColumnName is null;
SET @i=@i+1
END

Hopefully, you find this helpful.

Thanks,

Your friend, Annie