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The CREATE INDEX Syntax
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Creating an index using T-SQL is a lot easier than creating a table. In this section, we ll look only at indexes on tables, although there is an object within SQL Server called a view that can also be indexed. The full syntax for creating an index is not listed here, although you can find it within Books Online once you progress in your SQL Server knowledge. A reduced version will be sufficient while you are learning SQL Server 2005. Most of your indexes will use the following version: CREATE [UNIQUE] [CLUSTERED|NONCLUSTERED] INDEX index_name ON table (column [ASC|DESC] [ ,...n ] ) [WITH {IGNORE_DUP_KEY|DROP_EXISTING|SORT_IN_TEMPDB}] [ON filegroup ] Let s go through each point one by one so that the options in this cut-down version are clear: CREATE: Required. This keyword informs SQL Server that you will be building a new object. UNIQUE: Optional. If used, this option will inform SQL Server that the columns listed in the index will bring back a single unique row. This is enforced by SQL Server when attempting to insert a duplicate row, as an error message will be returned. CLUSTERED or NONCLUSTERED: Optional. If neither CLUSTERED nor NONCLUSTERED is explicitly listed, the index is created as NONCLUSTERED. INDEX: Required. This informs SQL Server that the new object will be an index.
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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index_name: Required. This is the name of the index being built. This name must be unique for the table, and it is advisable to keep this name unique for the database, using the naming method of IX_table_column discussed earlier. ON table: Required. This is the name of the table with which the index is associated. Only one table can be named. column: Required. This is the name of the column(s) in the table that we wish to include in the index. This is a comma-separated list. ASC: Optional (default). If neither ASC nor DESC is mentioned, then ASC is assumed. ASC informs SQL Server that it should store the column named in ascending sequence. DESC: Optional. This informs SQL Server that the column is to be stored in descending order. WITH: Optional. It is, however, required if any of the following options have to be used: IGNORE_DUP_KEY: This option is only available when the index is defined as UNIQUE. If this option has not been used earlier, then it is not available to you. I ll explain this further in a moment. DROP_EXISTING: This option is used if there is an existing index of the same name within the database. It will then drop the index before re-creating it. This is useful for performance if you are not actually changing any columns within the index. More on this in a moment. SORT_IN_TEMPDB: When building an index where there is already data within the table, it may be advisable, if the table is a large table, to get the data sorted for the index within the temporary database, tempdb, as mentioned in 3. Use this option if you have a large table, or if tempdb is on a different hard disk from your database. This option may speed up the building of the index, as SQL Server can simultaneously read from the disk device where the table is located and write to the disk device where tempdb is located. ON: Optional. This option is, however, required if you are going to specify a file group. It is not required if you wish the index to be built on the PRIMARY file group. filegroup: This is the name of the file group on which the index should be stored. At the moment, there is only one file group set up, PRIMARY. PRIMARY is a reserved word and is required to be surrounded by square brackets, [ ], if used. Two options need further clarification: IGNORE_DUP_KEY and DROP_EXISTING. We ll look at both in the sections that follow.
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