Scenario:
You are working as SQL Server developer, you are asked to provide a query that should return all the Unique Constraint with Columns, Table and Schema Name.
Solution:
We can use system objects to get list of unique constraints with columns, tables and schema name. Below query will return you all the unique constraints with columns from SQL Server database.
;WITH CTE_UQ
AS (
SELECT t.Table_Schema AS TableSchema
,t.table_name AS TableName
,c.column_name AS ColumnName
,t.constraint_name AS UniqueConstraintName
,t.constraint_type AS ConstraintType
FROM information_schema.table_constraints t
LEFTJOIN information_schema.key_column_usage c
ON t.constraint_catalog = c.constraint_catalog
AND t.constraint_schema = c.constraint_schema
AND t.constraint_name = c.constraint_name
WHERE t.constraint_type = 'UNIQUE'
)
SELECT TableSchema
,TableName
,UniqueConstraintName
,ConstraintType
,stuff((
SELECT',' + ColumnName
FROM CTE_UQ i
WHERE i.TableSchema = o.TableSchema
AND i.TableName = o.TableName
AND i.UniqueConstraintName = o.UniqueConstraintName
FOR XML path('')
), 1, 1, '') UniqueColumnList
FROM CTE_UQ o
GROUPBY TableSchema
,TableName
,UniqueConstraintName
,ConstraintType
I executed above query on database and got below results.
 |
| How to get Column List with Unique Constraints in SQL Server Database |