September 17, 2012 at 7:37 am
how to find duplicate default constraints in a table ,example DF_abc1 is a default constraint FOR column Effective date and again DF_efg1 is also a default constraint FOR same column Effective date,Now i have a scenario where i want to find the all duplicate default constraints on all the tables in a database, does anybody have any script for this .
thanks
September 17, 2012 at 8:33 am
Check this query:
SELECT CONSTRAINT_NAME, COUNT(*) FROM INFORMATION_SCHEMA.CONSTRAINT_TABLE_USAGE
GROUP BY CONSTRAINT_NAME
HAVING COUNT(*) > 1
September 17, 2012 at 3:14 pm
achtro (9/17/2012)
how to find duplicate default constraints in a table ,example DF_abc1 is a default constraint FOR column Effective date and again DF_efg1 is also a default constraint FOR same column Effective date,Now i have a scenario where i want to find the all duplicate default constraints on all the tables in a database, does anybody have any script for this .thanks
Perhaps your question is worded strangely, but you can't have duplicate default constraints for a column in a table. So you wouldn't need to look for duplicates.
If you're looking for default constraints with the same name across a number of tables then
sqlnaive's answer is what you want.
September 17, 2012 at 11:38 pm
I have to agree with NOT A DBA in that your question is worded strangely and his answer is basically correct.
I suspect you may be looking for something else, namely columns that appear like-named in different tables and have the same default values, but applied through a different DEFAULT constraint.
This query probably will help to get you started, if this is what you seek:
SELECT TABLE_NAME=b.name, COLUMN_NAME=a.name, CONSTRAINT_NAME=c.name, d.COLUMN_DEFAULT
FROM sys.all_columns a
INNER JOIN sys.tables b
ON a.object_id = b.object_id
INNER JOIN sys.default_constraints c
ON a.default_object_id = c.object_id
INNER JOIN information_schema.columns d
ON b.name = d.TABLE_NAME AND a.name = d.COLUMN_NAME
WHERE c.type_desc = 'DEFAULT_CONSTRAINT'
It lists all columns from all tables that have a DEFAULT CONSTRAINT, along with the DEFAULT CONSTRAINT name and the default value it assigns.
My thought question: Have you ever been told that your query runs too fast?
My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
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