To write a good performing procedure or function we should be aware about available wildcards in SQL Server. I found most developer depends on ‘%’ wildcard only while we have others as well. In this article we will discuss all the available wildcards in detail with examples. First of all let’s see when we need wildcards, sometimes we need to search records on the basis of some pattern then we need these wildcards, here is available wildcards in SQL Server
% To match zero or more character
_ To Match one character
[] To match any character in [character list]
[^] To match any character not in [character list] opposite of []
Let’s see how to use these useful wildcards, we will use all the examples with this very basic table Customers
CustomerID FirstName LastName Address
1001 Jacky John 127 Park Avenue
1002 Jack Smith A-923, Tank Apartments
1003 Abhay Jeet Lane 2, Colonel Street
1004 Grand Benson A-92 C, Park Street
To search those customers, whose address contain “Park”
SELECT * FROM Customers WHERE Address like ‘%Park%”
-- RESULT
CustomerID FirstName LastName Address
1001 Jacky John 127 Park Avenue
1004 Grand Benson A-92 C, Park Street
To search those customers, whose address ends with “Street”
SELECT * FROM Customers WHERE Address like ‘%Street”
-- RESULT
CustomerID FirstName LastName Address
1003 Abhay Jeet Lane 2, Colonel Street
1004 Grand Benson A-92 C, Park Street
To search those customers, whose address starts with “A-92”
SELECT * FROM Customers WHERE Address like ‘A-92%”
-- RESULT
CustomerID FirstName LastName Address
1002 Jack Smith A-923, Tank Apartments
1004 Grand Benson A-92 C, Park Street
Now let’s check for single character matches
Suppose we have to search customers whose first name start with “J” then any single character then “ck” followed by any character then we can use
SELECT * FROM Customers WHERE FirstName like ‘J_ck%”
-- RESULT
CustomerID FirstName LastName Address
1001 Jacky John 127 Park Avenue
1002 Jack Smith A-923, Tank Apartments
[character list] To get those customers whose address having at least one digit
SELECT * FROM Customers WHERE address Like ‘%[0123456789]%’
Or
SELECT * FROM Customers WHERE address Like ‘%[0-9]%’
To get those customers whose ID in range 1002 to 1009
SELECT * FROM Customers WHERE CustomerID Llike ‘100[2-9]’
To get those whose ID in range 1050 to 1099
SELECT * FROM Customers WHERE CustomerID Llike ‘100[5-9][0-9]'
[^character list] In the same way we can use [^] by placing ^ inside square bracket, for example suppose we don't want those customers whose Id ends with 7, 8 or 9 then, we can use
SELECT * FROM Customers WHERE CustomerID Like ‘%[^7-9]%’
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| By Dev D On 25 Feb, 13 Viewed: 667 |
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