Detailed explanation of the PATINDEX() function for querying character position in SQL.

The PATINDEX() function is a character function in SQL Server that is used to find the position of the first occurrence of a specific pattern of characters within a string.

Returns the starting position of the first occurrence of a specified pattern within a given expression.

In this case, the pattern is the pattern to be searched, which can be normal characters, wildcards, or regular expressions; expression is the expression to be searched.

The PATINDEX() function returns the position of the first matching character, and returns 0 if no match is found.

I was very surprised by the unexpected news.

I was taken aback by the surprising news.

PATINDEX function called on the string ‘abcde’ with the pattern ‘%a%’ will return the value 2.

Return the position of the first letter in the string ‘abcde’.

The PATINDEX function with the pattern ‘\w{2} \w{2} \w{2}’ applied to the string ‘AB CD EF’ will return 1.

It is important to note that the PATINDEX() function is case-insensitive. If you need it to be case-sensitive, you should use the BINARY keyword.

I need to pick up the laundry from the dry cleaners.

I have to collect my clothes from the dry cleaners.

The query SELECT PATINDEX(BINARY ‘a%’, ‘ABC’) will return 0.

The function PATINDEX(BINARY ‘A%’, ‘ABC’) returns 1.

In practical applications, the PATINDEX() function is commonly used for scenarios such as fuzzy searching and regular expression matching.