Note : MS Access uses an asterisk character (*) to replace the percentage character (%) Underscore (_) Represents a single character. Note : MS Access uses a question mark (?) Instead of underscores (_)
A percent sign can represent a string of characters of any length (including length 0). An underscore represents a number or a character. These symbols can be used in combination.
The syntax for using WILDCARD in SQL
The basic syntax of '%' and '_' is as follows:
SELECT FROM ten_bang WHERE cot LIKE 'XXXX%'
or:
SELECT FROM ten_bang WHERE cot LIKE '%XXXX%'
or:
SELECT FROM ten_bang WHERE cot LIKE 'XXXX_'
or:
SELECT FROM ten_bang WHERE cot LIKE '_XXXX'
or:
SELECT FROM ten_bang WHERE cot LIKE '_XXXX_'
You can combine N conditions using AND or OR operators. Here, XXXX can be any numeric or string value.
Example of WILDCARD operator
The following table has a few examples showing the WHERE clause has a LIKE clause with different WILDCARD '%' and '_' operators:
STTStatement and description 1 WHERE SALARY LIKE '200%' Find all values starting with 200. 2 WHERE SALARY LIKE '% 200%' Find all values that have 200 any position. 3 WHERE SALARY LIKE '_00%' Find all values that have 00 in the second and third positions. 4 WHERE SALARY LIKE '2 _% _%' Find all values that begin with 2 and have at least 3 characters. 5 WHERE SALARY LIKE '% 2' Find all values ending in 2. 6 WHERE SALARY LIKE '_2% 3' Find all values with position 2 in the second position and end with 3. 7 WHERE SALARY LIKE '2___3' Find all values in the five-digit number beginning with 2 and ending with 3.
Let us take a practical example, considering the table NHANVIEN has the following records:
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