What is CHARINDEX vs PATINDEX ?

CHARINDEX vs PATINDEX

We can use either CHARINDEX or PATINDEX to search in TEXT field in SQL SERVER. The CHARINDEX and PATINDEX functions return the starting position of a pattern you specify.

Both functions take two arguments. With PATINDEX, you must include percent signs before and after the pattern, unless you are looking for the pattern as the first (omit the first %) or last (omit the last %) characters in a column. For CHARINDEX, the pattern cannot include wildcard characters. The second argument is a character expression, usually a column name, in which Adaptive Server searches for the specified pattern.

Example of CHARINDEX:

USE AdventureWorks;

GO

SELECT CHARINDEX('ensure', DocumentSummary)

FROM Production.Document

WHERE DocumentID = 3;

GO

Examples of PATINDEX:

USE AdventureWorks;

GO

SELECT PATINDEX('%ensure%',DocumentSummary)

FROM Production.Document

WHERE DocumentID = 3;

GO