How do I index a database column

Question

Hopefully, I can get answers for each database server.

For an outline of how indexing works check out: How does database indexing work?

Answer 1

To create indexes following stuff can be used:

1. Creates an index on a table. Duplicate values are allowed: CREATE INDEX index_name ON table_name (column_name)

2. Creates a unique index on a table. Duplicate values are not allowed: CREATE UNIQUE INDEX index_name ON table_name (column_name)

3. Clustered Index: CREATE CLUSTERED INDEX CL_ID ON SALES(ID);

4. Non-clustered index:
   CREATE NONCLUSTERED INDEX NONCI_PC ON SALES(ProductCode);

Refer: http://www.codeproject.com/Articles/190263/Indexes-in-MS-SQL-Server for details.