Question

how is pattern matching carried out in select queries?
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Answer 1

Answer:

The LIKE operator provides standard pattern matching in SQL that is always used after a WHERE clause. It matches any pattern based on some conditions provided using the wildcard characters. Some of the commonly used wildcard characters in MySQL are as follows: '%' represents zero or more characters.

Answer 2

Answer:

SEE DOWN.....

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Explanation:

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What is Pattern matching in SQL and how it is done?

In SQL, we sometimes need to filter our resultset based on some pattern matching techniques. SQL has a standard pattern matching technique using the 'LIKE' operator. But, it also supports the regular expression pattern matching for better functionality.

Generally, the REGEXP_LIKE(column_name, 'regex') function is used for pattern matching in SQL. SQL also supports some operators that work similar to this function, these are: 'REGEXP' and 'RLIKE' operator. So in this blog, we will learn about all those functions and operators that provide pattern matching functionality in SQL.

Note: In this blog, we will take all the examples using the MySQL database only. We'll be using the below-mentioned course table for demonstrating the examples. The table is as follows:

Now let us learn about these pattern-matching functions and operators one-by-one.

LIKE Operator

The LIKE operator provides standard pattern matching in SQL that is always used after a WHERE clause. It matches any pattern based on some conditions provided using the wildcard characters.

Some of the commonly used wildcard characters in MySQL are as follows:

'%' represents zero or more characters.

'_' represents exactly 1 character.

In MySQL the syntax of the LIKE operator can be as follows:

SELECT [table.columns..] FROM table WHERE table.column LIKE 'wildcard_characters';

Now let us take an example using the wildcard characters 'd%' that searches for 'd' in the beginning and then there can be zero or any number of characters because % denotes zero or more characters.

The MySQL query for the above operation can be: