How to merge two data entries in MySQL into one entry?

2 years ago
Olivia Parker
1 minute

To combine two data into one, you can use MySQL string functions and aggregate functions. Let’s say we have the following two sets of data:

Data 1:

SELECT * FROM table_name WHERE id = 1;

Data 2:

SELECT * FROM table_name WHERE id = 2;

You can use string functions CONCAT and GROUP_CONCAT to combine two pieces of data into one. Let’s say we have two fields: field1 and field2.

SELECT CONCAT(field1, ' ', field2) AS merged_data
FROM (
  SELECT CONCAT(field1, ' ', field2) AS field1, '' AS field2
  FROM table_name
  WHERE id = 1
  UNION ALL
  SELECT '' AS field1, CONCAT(field1, ' ', field2) AS field2
  FROM table_name
  WHERE id = 2
) subquery
GROUP BY field1;

The above query will return merged data. Simply add more UNION ALL clauses and include corresponding CONCAT and GROUP_CONCAT statements in the SELECT clause if more data needs to be merged.

Please note that the empty string ” in the above query may need to be adjusted based on the actual situation in order to properly merge the data.

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