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Using indexes with InterBase
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The types of indexes and the best choice depends on the DBMS. The following has been found for InterBase.
1) create indexes on columns that are used in where or join clauses of your SQL statements
2) if you use ORDER BY constructs, have an (compound) index of fields in the same order as in the ORDER BY construct
3) if you combine conditions with OR, you may want to have single indexes on each field of your conditions
select * from t where col1 =