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PostgreSQL (or any other DB engine, for that matter) will read your index in either way fine. You'll get an index scan or a reverse index scan. The problem is when you've got a multi-column scan. In this case: index on (foo, bar) will work for foo asc, bar asc, as well as foo desc, bar desc.In single-column indexes the options are indeed redundant, but in multicolumn indexes they can be useful. Consider a two-column index on (x, y): this can satisfy ORDER BY x, y if we scan forward, or ORDER BY x DESC, y DESC if we scan backward. But it might be that the application frequently needs to use ORDER BY x ASC, y DESC.An overview of the types of indexes available in PostgreSQL, and the different ways of using and maintaining the most common index type: B-Trees.. It becomes even more relevant when used against a multi-column index when a query requests a mixed sort order, like a ASC, b DESC.
The Index dialog organizes the development of a index through the following dialog tabs: General and Definition. The SQL tab displays the SQL code generated by dialog selections. Use the fields in the General tab to identify the index: Use the Name field to add a descriptive name for the index.Lifestages Centers for Women specializes in obstetrics and gynecology, urogynecology and midwifery. Located in Dayton, OH and proudly serving Southwest Ohio, Lifestages Centers for Women and its board-certified providers are members of the Premier Physician Network.
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