June 2015
Intermediate to advanced
1800 pages
70h 6m
English
book
Microsoft SQL Server 2014 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
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Identifying OR Clauses
The next statements the Query Optimizer looks for in the query are OR clauses. OR clauses are SARGable expressions combined with an OR condition rather than an AND condition and are treated differently than standard SARGs. The format of an OR clause is with all columns involved in the OR belonging to the same table.
SARG or SARG [or ...]
This IN statement
column in ( constant1, constant2, ...)
is also treated as an OR clause, becoming this:
column = constant1 or column = constant2 or ...
Some examples of OR clauses are as follows:
where LastName = 'Smith' or FirstName = 'Fred'where (Name like '%bearing%' and ListPrice > $25) or ...
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