2015. 6. 20. 23:35
http://www.w3schools.com/sql/sql_func_mid.asp
The MID() Function
The MID() function is used to extract characters from a text field.
SQL MID() Syntax
SELECT MID(column_name,start[,length]) AS some_name FROM table_name;
Parameter | Description |
---|---|
column_name | Required. The field to extract characters from |
start | Required. Specifies the starting position (starts at 1) |
length | Optional. The number of characters to return. If omitted, the MID() function returns the rest of the text |
Note: The equivalent function for SQL Server is SUBSTRING():
SELECT SUBSTRING(column_name,start,length) AS some_name FROM table_name;
Demo Database
In this tutorial we will use the well-known Northwind sample database.
Below is a selection from the "Customers" table:
CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
---|---|---|---|---|---|---|
1 | Alfreds Futterkiste | Maria Anders | Obere Str. 57 | Berlin | 12209 | Germany |
2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 05021 | Mexico |
3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 05023 | Mexico |
4 | Around the Horn | Thomas Hardy | 120 Hanover Sq. | London | WA1 1DP | UK |
5 | Berglunds snabbköp | Christina Berglund | Berguvsvägen 8 | Luleå | S-958 22 | Sweden |
SQL MID() Example
The following SQL statement selects the first four characters from the "City" column from the "Customers" table:
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