PostgreSQL – LIKE operator
The PostgreSQL LIKE operator is used query data using pattern matching techniques. Its result include strings that are case-sensitive and follow the mentioned pattern.
It is important to know that PostgreSQL provides with 2 special wildcard characters for the purpose of patterns matching as below:
- Percent ( %) for matching any sequence of characters.
- Underscore ( _) for matching any single character.
Syntax: string LIKE pattern;
For the sake of this article we will be using the sample DVD rental database, which is explained here and can be downloaded by clicking on this link in our examples.
Now, let’s look into a few examples.
Here we will make a query to find the customer in the “customer” table by looking at the “first_name” column to see if there is any value that begins with “K” using the LIKE operator in our sample database.
first_name LIKE 'K%';
Notice few things in the above example, the WHERE clause contains a special expression: the first_name, the LIKE operator, and a string that contains a percent (%) character, which is referred to as a pattern.
Here we will query for customers whose first name begins with any single character, is followed by the literal string “her”, and ends with any number of characters using the LIKE operator in our sample database.
first_name LIKE '_her%';
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