e Gyan: 2/27/11

How do I find the data types of the columns of a specified table?
Before you run the following query, replace and with valid names.

USE ;
GO
SELECT c.name AS column_name
,c.column_id
,SCHEMA_NAME(t.schema_id) AS type_schema
,t.name AS type_name
,t.is_user_defined
,t.is_assembly_type
,c.max_length
,c.precision
,c.scale
FROM sys.columns AS c
JOIN sys.types AS t ON c.user_type_id=t.user_type_id
WHERE c.object_id = OBJECT_ID('')
ORDER BY c.column_id;
GO

How do I find all the owners of entities contained in a specified schema?

USE ;
GO
SELECT 'OBJECT' AS entity_type
,USER_NAME(OBJECTPROPERTY(object_id, 'OwnerId')) AS owner_name
,name
FROM sys.objects WHERE SCHEMA_NAME(schema_id) = ''
UNION
SELECT 'TYPE' AS entity_type
,USER_NAME(TYPEPROPERTY(SCHEMA_NAME(schema_id) + '.' + name, 'OwnerId')) AS owner_name
,name
FROM sys.types WHERE SCHEMA_NAME(schema_id) = ''
UNION
SELECT 'XML SCHEMA COLLECTION' AS entity_type
,COALESCE(USER_NAME(xsc.principal_id),USER_NAME(s.principal_id)) AS owner_name
,xsc.name
FROM sys.xml_schema_collections AS xsc JOIN sys.schemas AS s
ON s.schema_id = xsc.schema_id
WHERE s.name = '';
GO

How do I find all the tables that do not have a primary key?

USE ;
GO
SELECT SCHEMA_NAME(t.schema_id) AS schema_name
,t.name AS table_name
FROM sys.tables t
WHERE object_id NOT IN
(
SELECT parent_object_id
FROM sys.key_constraints
WHERE type_desc = 'PRIMARY_KEY_CONSTRAINT' -- or type = 'PK'
);
GO

Or, you can run the following query.

USE ;
GO
SELECT SCHEMA_NAME(schema_id) AS schema_name
,name AS table_name
FROM sys.tables
WHERE OBJECTPROPERTY(object_id,'TableHasPrimaryKey') = 0
ORDER BY schema_name, table_name;
GO

How do I find all the tables that do not have an index?

USE ;
GO
SELECT SCHEMA_NAME(schema_id) AS schema_name
,name AS table_name
FROM sys.tables
WHERE OBJECTPROPERTY(object_id,'IsIndexed') = 0
ORDER BY schema_name, table_name;
GO

How do I find all the tables that have an identity column?

USE ;
GO
SELECT SCHEMA_NAME(schema_id) AS schema_name
, t.name AS table_name
, c.name AS column_name
FROM sys.tables AS t
JOIN sys.identity_columns c ON t.object_id = c.object_id
ORDER BY schema_name, table_name;
GO

Or, you can run the following query.
USE ;
GO
SELECT SCHEMA_NAME(schema_id) AS schema_name
,name AS table_name
FROM sys.tables
WHERE OBJECTPROPERTY(object_id,'TableHasIdentity') = 1
ORDER BY schema_name, table_name;
GO

How do I find all the stored procedures in a database?

USE ;
GO
SELECT name AS procedure_name
,SCHEMA_NAME(schema_id) AS schema_name
,type_desc
,create_date
,modify_date
FROM sys.procedures;
GO

How do I find the parameters for a specified stored procedure or function?

USE ;
GO
SELECT SCHEMA_NAME(schema_id) AS schema_name
,o.name AS object_name
,o.type_desc
,p.parameter_id
,p.name AS parameter_name
,TYPE_NAME(p.user_type_id) AS parameter_type
,p.max_length
,p.precision
,p.scale
,p.is_output
FROM sys.objects AS o
INNER JOIN sys.parameters AS p ON o.object_id = p.object_id
WHERE o.object_id = OBJECT_ID('')
ORDER BY schema_name, object_name, p.parameter_id;
GO

How do I find all the user-defined functions in a database?

USE ;
GO
SELECT name AS function_name
,SCHEMA_NAME(schema_id) AS schema_name
,type_desc
,create_date
,modify_date
FROM sys.objects
WHERE type_desc LIKE '%FUNCTION%';
GO

How do I find all views in a database?

USE ;
GO
SELECT name AS view_name
,SCHEMA_NAME(schema_id) AS schema_name
,OBJECTPROPERTYEX(object_id,'IsIndexed') AS IsIndexed
,OBJECTPROPERTYEX(object_id,'IsIndexable') AS IsIndexable
,create_date
,modify_date
FROM sys.views;
GO

How do I find all the entities that have been modified in the last N days?

USE ;
GO
SELECT name AS object_name
,SCHEMA_NAME(schema_id) AS schema_name
,type_desc
,create_date
,modify_date
FROM sys.objects
WHERE modify_date > GETDATE() -
ORDER BY modify_date;
GO

How do I view the definition of a server-level trigger?

SELECT definition
FROM sys.server_sql_modules;
GO

How do I find the columns of a primary key for a specified table?

USE ;
GO
SELECT i.name AS index_name
,ic.index_column_id
,key_ordinal
,c.name AS column_name
,TYPE_NAME(c.user_type_id)AS column_type
,is_identity
FROM sys.indexes AS i
INNER JOIN sys.index_columns AS ic
ON i.object_id = ic.object_id AND i.index_id = ic.index_id
INNER JOIN sys.columns AS c
ON ic.object_id = c.object_id AND c.column_id = ic.column_id
WHERE i.is_primary_key = 1
AND i.object_id = OBJECT_ID('');
GO

Or, you can use the COL_NAME function as shown in the following example.

USE ;
GO
SELECT i.name AS index_name
,COL_NAME(ic.object_id,ic.column_id) AS column_name
,ic.index_column_id
,key_ordinal
FROM sys.indexes AS i
INNER JOIN sys.index_columns AS ic
ON i.object_id = ic.object_id AND i.index_id = ic.index_id
WHERE i.is_primary_key = 1
AND i.object_id = OBJECT_ID('');
GO

How do I find the columns of a foreign key for a specified table?

USE ;
GO
SELECT
f.name AS foreign_key_name
,OBJECT_NAME(f.parent_object_id) AS table_name
,COL_NAME(fc.parent_object_id, fc.parent_column_id) AS constraint_column_name
,OBJECT_NAME (f.referenced_object_id) AS referenced_object
,COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS referenced_column_name
,is_disabled
,delete_referential_action_desc
,update_referential_action_desc
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
ON f.object_id = fc.constraint_object_id
WHERE f.parent_object_id = OBJECT_ID('');

How do I determine if a column is used in a computed column expression?

USE ;
GO
SELECT OBJECT_NAME(object_id) AS object_name
,COL_NAME(object_id, column_id) AS computed_column
,class_desc
,is_selected
,is_updated
,is_select_all
FROM sys.sql_dependencies
WHERE referenced_major_id = OBJECT_ID('')
AND referenced_minor_id = COLUMNPROPERTY(referenced_major_id, '', 'ColumnId')
AND class = 1;
GO

How do I find all the columns that are used in a computed column expression?
USE ;
GO
SELECT OBJECT_NAME(d.referenced_major_id) AS object_name
,COL_NAME(d.referenced_major_id, d.referenced_minor_id) AS column_name
,OBJECT_NAME(referenced_major_id) AS dependent_object_name
,COL_NAME(d.object_id, d.column_id) AS dependent_computed_column
,cc.definition AS computed_column_definition
FROM sys.sql_dependencies AS d
JOIN sys.computed_columns AS cc
ON cc.object_id = d.object_id AND cc.column_id = d.column_id AND d.object_id=d.referenced_major_id
WHERE d.class = 1
ORDER BY object_name, column_name;
GO

How do I find all the constraints for a specified table?

USE ;
GO
SELECT OBJECT_NAME(object_id) as constraint_name
,SCHEMA_NAME(schema_id) AS schema_name
,OBJECT_NAME(parent_object_id) AS table_name
,type_desc
,create_date
,modify_date
,is_ms_shipped
,is_published
,is_schema_published
FROM sys.objects
WHERE type_desc LIKE '%CONSTRAINT'
AND parent_object_id = OBJECT_ID('');
GO

How do I find all the indexes for a specified table?

USE ;
GO
SELECT i.name AS index_name
,i.type_desc
,is_unique
,ds.type_desc AS filegroup_or_partition_scheme
,ds.name AS filegroup_or_partition_scheme_name
,ignore_dup_key
,is_primary_key
,is_unique_constraint
,fill_factor
,is_padded
,is_disabled
,allow_row_locks
,allow_page_locks
FROM sys.indexes AS i
INNER JOIN sys.data_spaces AS ds ON i.data_space_id = ds.data_space_id
WHERE is_hypothetical = 0 AND i.index_id <> 0
AND i.object_id = OBJECT_ID('');
GO

e Gyan

Thursday, March 3, 2011

Most popular Used Regular Expression

Tuesday, March 1, 2011

List of Querying the SQL Server System Catalog