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non-sargable is to include in the WHERE clause a function operating on a column value. The WHERE clause is not the only clause where sargability can matter; it can also have an effect on ORDER BY, GROUP BY and HAVING clauses. The SELECT clause, on the other hand, can contain non-sargable
303:. Conceptually, an index is simply a mapping between a value and one or more locations. With a functional index, the value stored in the index is the output of the function specified when the index is created. This capability expands what is sargable beyond base column expressions.
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This is sargable because myIntField is NOT contained in a function, making any available indexes on myIntField potentially usable. Furthermore, the expression is evaluated only once, rather than for each record in the table.
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is to convert them to be sargable. The effect is similar to searching for a specific term in a book that has no index, beginning at page one each time, instead of jumping to a list of specific pages identified in an index.
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matching query to indexes instead of a complex, time-consuming cost-based search, thus it is often desired to write sargable queries. A query failing to be sargable is known as a
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clauses that are sargable typically have field values on the left of the operator, and scalar values or expressions on the right side of the operator.
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because myIntField is embedded in a function. If any indexes were available on myIntField, they could not be used. In addition,
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researchers as a contraction of Search ARGument, and has come to mean simply "can be looked up by an index."
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by Kalen
Delaney, Connor Cunningham, Jonathan Kehayias, Benjamin Nevarez, Paul S. Randal (O'Reily, 2013)
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This is sargable. It can use an index to find all the myNameField values that start with the substring
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SQL Shack - How to use sargable expressions in T-SQL queries; performance advantages and examples
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Selinger, P. Griffiths; Astrahan, M. M.; Chamberlin, D. D.; Lorie, R. A.; Price, T. G. (1979).
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Proceedings of the 1979 ACM SIGMOD international conference on
Management of data - SIGMOD '79
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to speed up the execution of the query. The term is derived from a contraction of
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sargable. It must examine every row to find the fields containing the substring
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query and typically has a negative effect on query time, so one of the steps in
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clauses that are sargable have field values on the left of the operator, and
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91:. Statements consisting only of original research should be removed.
788:(7th ed.). New York, NY: McGraw-Hill Education. p. 773.
749:"Access path selection in a relational database management system"
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DBA.StackExchange.com - What does the word “SARGable” really mean?
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Silberschatz, Abraham; Korth, Henry F.; Sudarshan, S. (2020).
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expressions without adversely affecting the performance.
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by Peter
Gulutzan, Trudy Pelzer (Addison Wesley, 2002)
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Sargable operators that rarely improve performance:
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151:introducing citations to additional sources
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107:Learn how and when to remove this message
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141:Relevant discussion may be found on the
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291:The typical situation that will make a
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252:. It was first used by
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307:Sargable operators:
250:Search ARGument ABLE
234:relational databases
147:improve this article
642:Query optimization
587:Sargable version:
468:Sargable version:
285:query optimization
72:possibly contains
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822:Simple "Searches"
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560:myNameField
97:August 2015
847:Categories
733:2024-01-25
699:References
488:myIntField
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273:query plan
203:April 2013
173:newspapers
162:"Sargable"
81:improve it
36:improve it
293:SQL query
277:heuristic
143:talk page
85:verifying
42:talk page
724:Archived
631:See also
574:This is
452:This is
369:<>
265:sargable
238:sargable
601:myTable
554:myTable
482:myTable
426:myTable
340:BETWEEN
240:if the
187:scholar
79:Please
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473:SELECT
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727:(PDF)
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648:Notes
604:WHERE
557:WHERE
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429:WHERE
406:WHERE
334:<=
328:>=
246:index
194:JSTOR
180:books
833:ISBN
812:ISBN
790:ISBN
765:ISBN
610:LIKE
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519:...
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432:SQRT
423:FROM
393:LIKE
355:NULL
346:LIKE
322:<
316:>
269:OLTP
242:DBMS
166:news
757:doi
576:not
390:NOT
381:NOT
375:NOT
254:IBM
232:In
149:by
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384:IN
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