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The like operator is used in a where clause to search for a specified pattern in a column.
Although these functions are not commonly used, these are really powerful in searching a pattern and returning the location of text/ string/ pattern.
Charindex('sql', 'microsoft sql server') this function call will return the patindex supports wildcard characters in the search pattern string.
Search expression to find the last occurrence of a pattern.
1* select regexp_instr( str, 'a', -1 ) from foo sql introduction to regular expressions continued.