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MS SQL Server Interview Question:
How To Drop Existing Indexes in MS SQL Server?
Submitted by: AdministratorFor some reason, if you want remove an existing index, you can use the DROP INDEX statement with following syntax:
CREATE INDEX table_name.index_name
The tutorial exercise below shows you how to remove the index "ggl_links_id":
USE GlobalGuideLineDatabase;
GO
SELECT * FROM sys.indexes WHERE object_id = (
SELECT object_id FROM sys.tables WHERE name = 'ggl_links'
);
GO
<pre>object_id name index_id type_desc is_unique
--------- ------------- -------- ---------- ---------
421576540 NULL 0 HEAP 0
421576540 ggl_links_id 2 NONCLUSTERED 0
421576540 ggl_links_url 3 NONCLUSTERED 0</pre>
DROP INDEX ggl_links.ggl_links_id;
GO
SELECT * FROM sys.indexes WHERE object_id = (
SELECT object_id FROM sys.tables WHERE name = 'ggl_links'
);
GO
<pre>object_id name index_id type_desc is_unique
--------- ------------- -------- ---------- ---------
421576540 NULL 0 HEAP 0
421576540 ggl_links_url 3 NONCLUSTERED 0</pre>
Submitted by: Administrator
CREATE INDEX table_name.index_name
The tutorial exercise below shows you how to remove the index "ggl_links_id":
USE GlobalGuideLineDatabase;
GO
SELECT * FROM sys.indexes WHERE object_id = (
SELECT object_id FROM sys.tables WHERE name = 'ggl_links'
);
GO
<pre>object_id name index_id type_desc is_unique
--------- ------------- -------- ---------- ---------
421576540 NULL 0 HEAP 0
421576540 ggl_links_id 2 NONCLUSTERED 0
421576540 ggl_links_url 3 NONCLUSTERED 0</pre>
DROP INDEX ggl_links.ggl_links_id;
GO
SELECT * FROM sys.indexes WHERE object_id = (
SELECT object_id FROM sys.tables WHERE name = 'ggl_links'
);
GO
<pre>object_id name index_id type_desc is_unique
--------- ------------- -------- ---------- ---------
421576540 NULL 0 HEAP 0
421576540 ggl_links_url 3 NONCLUSTERED 0</pre>
Submitted by: Administrator
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