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Why use the MySQL aggregate function to concatenate strings?

To concatenate strings from numerous rows into a single string in MySQL, we may utilize the GROUP_CONCAT() function as an aggregate function.

This method can merge string values from many rows inside a group into a single result.

The following is a description of how GROUP_CONCAT() works or aggregate function to concatenate strings:

1. The GROUP_CONCAT() method has the following basic syntax:

   
2. Column Name:

   We should replace the Column_name with the name of the column that we need to concatenate.

   We can use any string column in the database.
3. Separator:

   Set the separator character or string to use to separate the concatenated items.

   Define the separator using the SEPARATOR keyword. If we don’t provide a separator, we can use a comma (,).
4. Table Name:

   Table_name should be replaced with the name of the table from which we wish to obtain the data.
5. Conditions:

   To filter the rows before concatenation, we may use the WHERE clause to set criteria. This is the condition for mysql aggregate function to concatenate strings.
6. Grouping Columns:

   Use the GROUP BY clause and define the grouping columns to concatenate texts based on particular groupings.

   This guarantees that the concatenation is carried out independently for each group.
7. Execution:

   Execute the SQL query, and the GROUP_CONCAT() function will concatenate the values from the selected column using the separator and grouping supplied.

MySQL aggregate function to concatenate strings: Example

Let’s make a table to better grasp the syntax above. The following is the query to construct a table:

Using the insert command, add some records to the table. The insert record query is as follows:

Display all records from the table using select statement. The query is as follows:

mysql> select *from GroupConcatenateDemo;

The output is as shown below:

In MySQL, this is the query that uses GROUP BY to concatenate the strings.

GROUP BY Id and concatenate the strings in MySQL using the GROUP_CONCAT() method.

The following is the query:

The output is given below

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Conclusion

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