In this blog post, we will explore some commonly used string functions in SQL’s SELECT statement. These functions allow you to manipulate and perform operations on string data types within the SELECT query.

1. CONCAT

The CONCAT function is used to concatenate two or more strings together. It takes the form CONCAT(string1, string2, ...), where string1 and string2 are the strings to be concatenated.

SELECT CONCAT(first_name, ' ', last_name) AS full_name
FROM users;

In the example above, the CONCAT function is used to concatenate the first_name and last_name columns, separated by a space. The result will be displayed as the full_name column.

2. SUBSTRING

The SUBSTRING function is used to extract a portion of a string. It takes the form SUBSTRING(string, start_position, length), where string is the source string, start_position is the starting index of the substring, and length is the number of characters to include.

SELECT SUBSTRING(email, 1, 5) AS username
FROM users;

In the example above, the SUBSTRING function is used to extract the first 5 characters from the email column. The result will be displayed as the username column.

3. UPPER and LOWER

The UPPER and LOWER functions are used to convert a string to uppercase and lowercase, respectively. They take the form UPPER(string) and LOWER(string), where string is the source string.

SELECT UPPER(username) AS uppercase_username, LOWER(email) AS lowercase_email
FROM users;

In the example above, the UPPER function is used to convert the username column to uppercase, and the LOWER function is used to convert the email column to lowercase. The results will be displayed as the uppercase_username and lowercase_email columns.

Conclusion

In this blog post, we have explored some commonly used string functions in SQL’s SELECT statement. The CONCAT function allows us to concatenate strings, the SUBSTRING function allows us to extract substrings, and the UPPER and LOWER functions allow us to convert strings to uppercase and lowercase, respectively. These functions are useful for manipulating and working with string data in SQL queries.

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