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The SQL standard does not provide any way for the database user or administrator to control what indices are created and maintained in the database system Indices are not required for correctness, since they are redundant data structures However, indices are important for ef cient processing of transactions, including both update transactions and queries Indices are also important for ef cient enforcement of integrity constraints For example, typical implementations enforce a key declaration ( 6) by creating an index with the declared key as the search key of the index In principle, a database system can decide automatically what indices to create However, because of the space cost of indices, as well as the effect of indices on update processing, it is not easy to automatically make the right choices about what indices to maintain Therefore, most SQL implementations provide the programmer control over creation and removal of indices via data-de nition-language commands We illustrate the syntax of these commands next Although the syntax that we show is widely used and supported by many database systems, it is not part of the SQL:1999 standard The SQL standards (up to SQL:1999, at least) do not support control of the physical database schema, and have restricted themselves to the logical database schema We create an index by the create index command, which takes the form create index <index-name> on <relation-name> (<attribute-list>) The attribute-list is the list of attributes of the relations that form the search key for the index To de ne an index name b-index on the branch relation with branch-name as the search key, we write generate pdf417 c# How to generate 2d barcode like Data matrix, PDF417 in C# - CodeProject
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