![]() ![]() We can use the addition “+” operator to add two or more strings together. Let’s say we have the same strings “edureka” and “SQL”, to concatenate these two strings we will write the following command. It works the same with the CONCAT function as well. And if we concatenate these two strings, we will get a resultant string or concatenated string as “edureka SQL”. So ideally concatenation works like- let’s say we have two strings, “edureka”, “SQL”. To understand how we can use CONCAT in SQL, let us take a simple example. The CONCAT function can take up to 255 input strings for concatenation. The CONCAT function will implicitly convert those values before the concatenation. If at all, non-character string values are passed as input. There has to be at least two strings as input for the CONCAT function to work without any hassles. The CONCAT function raises an error if only one string is passed as input. There are a few things you should keep in mind while using the CONCAT function. ![]() In SQL, the concatenation of strings is achieved by the CONCAT() function. The following topics are covered in this blog: In this article, we will learn how we can use the CONCAT() function in SQL. It takes up to 255 input strings and joins them together. In SQL, this is achieved by a function named CONCAT(). Thank you all, I hope that my article helped you in some way.Concatenation, in general, refers to binding a bunch of strings into a single string. Sql> SELECT CONCAT_WS('-',first_name, middle_name) FROM fio WHERE id = 5 With the CONCAT_WS function, everything is a little different, if one of the fields contains NULL values, then the function will return the values of that field that are not NULL. Sql> SELECT CONCAT_WS('-',first_name, last_name) FROM fio WHERE id = 1 Īs we remember from the example above, if NULL values are passed to the CONCAT function, then the function itself will return NULL. We will use the same examples as I showed above, only now instead of the CONCAT function we will use the CONCAT_WS function with a delimiter. The CONCAT_WS function differs from the CONCAT function in that CONCAT_WS takes a line separator as the first parameter, and only then the fields of the lines that we want to concatenate. SELECT CONCAT_WS(separator, string_1,string_2.) FROM table_name WHERE field_name = value Sql> SELECT CONCAT(first_name, middle_name) AS fio FROM fio WHERE id = '5' When concatenating strings using the CONCAT() function, one very important detail must be taken into account, if one of fields is NULL, then the function will return NULL. In order to add a separator, you can add another line, but it will be as a space. Sql> SELECT CONCAT(first_name, ' ' ,last_name) AS fio FROM fio WHERE id = '1' Īs you can see, as a result, we combined two fields, but there is no separator between them. In the first variant, we will try combine two fields, the user's first and last names. ![]() SELECT CONCAT(string_1,string_2.) FROM table_name WHERE field_name = valueĪ function can take one or more strings to concatenate. We will see how the functions work on the fio table that I created and added a few lines to it. Two functions CONCAT() and CONCAT_WS() are responsible for concatenating rows in the MySQL and MariaDB database. Combining row fields into a single field in the result set is possible using several string manipulation functions. In today's article, we will look at how it is possible to combine rows into a single row in a MySQL and MariaDB database. It would seem that this is a fairly simple task, but not everything is so simple. ![]()
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