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I have to use INSERT and UPDATE in single query. For that SQL having MERGE statement.
Is MERGE statement supported in MySQL. If supported, please provide sample.
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To merge rows in MySQL, use GROUP_CONCAT().
Ans: Joining two tables in SQL can be done in four major ways: Inner Join (returns rows with matching columns), Left Join (ALL records in the left table and matching records in the right table), Right Join (ALL records in the right table and matching records in the left table), and Union (removes duplicates).
It lets you avoid multiple INSERT , UPDATE , and DELETE DML statements. MERGE is a deterministic statement. That is, you cannot update the same row of the target table multiple times in the same MERGE statement.
SQL JOIN. A JOIN clause is used to combine rows from two or more tables, based on a related column between them. Notice that the "CustomerID" column in the "Orders" table refers to the "CustomerID" in the "Customers" table. The relationship between the two tables above is the "CustomerID" column.
MERGE is not supported by MySQL, However, there is other possible way of doing the same:
INSERT...ON DUPLICATE KEY UPDATE
If you specify the ON DUPLICATE KEY UPDATE option in the INSERT statement and the new row causes a duplicate value in the UNIQUE or PRIMARY KEY index, MySQL performs an update to the old row based on the new values.
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