SA0007 : Pattern starting with "%" in LIKE predicate
The topic describes the SA0007 analysis rule.
Pattern starting with "%" in LIKE predicate
This rule checks for usage of wildcard characters at the beginning of a word while searching using the LIKE keyword.
Usage of wildcard characters at the beginning of a LIKE pattern results in an index scan, which defeats the purpose of an index.
The rule has a Batch scope and is applied only on the SQL script.
Parameter specifies whether to ignore LIKE predicate with pattern starting with "%" when it appears inside non-DML statements.
The rule does not need Analysis Context or SQL Connection.
There is no additional info for this rule.
1SELECT LocationID 2FROM Locations 3WHERE Specialities LIKE '%pples' 4 5SELECT LocationID 6FROM Locations 7WHERE Specialities LIKE 'A%s' 8 9SELECT LocationID 10FROM Locations 11WHERE Specialities LIKE 'Ap%' 12 13SELECT LocationID 14FROM Locations 15WHERE Specialities LIKE '%pples' /*IGNORE:SA0007*/ 16 17 18SELECT LocationID 19FROM Locations /*IGNORE:SA0007(STATEMENT)*/ 20WHERE Specialities LIKE '%pples' 21 22IF db_name() like '%za%' 23PRINT db_name()
|1||SA0007 : Pattern starting with "%" in LIKE predicate.||3||29|
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