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I heard that its not advised to use % in the beginning of LIKE clause in SQL Server due to performance reasons.Why is this is so?
Some more details on this will help me in understanding the impact of this issue.
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The SQL LIKE Operator The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are two wildcards often used in conjunction with the LIKE operator: The percent sign (%) represents zero, one, or multiple characters. The underscore sign (_) represents one, single character.
The SQL LIKE clause is used to compare a value to similar values using wildcard operators. There are two wildcards used in conjunction with the LIKE operator. The percent sign represents zero, one or multiple characters. The underscore represents a single number or character.
The SQL Like is a logical operator that is used to determine whether a specific character string matches a specified pattern. It is commonly used in a Where clause to search for a specified pattern in a column. This operator can be useful in cases when we need to perform pattern matching instead of equal or not equal.
You can use LIKE with OR operator which works same as IN operator.
A % on the beginning of a LIKE clause means that indexes are completely useless. If there is static text to anchor the pattern to in front of the %, there's at least potential utility to be obtained from indexes.
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