What is MERGE function in SQL?

The MERGE statement in SQL is a very popular clause that can handle inserts, updates, and deletes all in a single transaction without having to write separate logic for each of these. The MERGE statement tries to compare the source table with the target table based on a key field and then do some of the processing.

How do you write a merged query in SQL?

First, you specify the target table and the source table in the MERGE clause. Second, the merge_condition determines how the rows from the source table are matched to the rows from the target table. It is similar to the join condition in the join clause.


This statement is a convenient way to combine multiple operations. 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.

What is MERGE in SQL with example?

The MERGE statement allows you to join a data source table with a target table or view, and then perform multiple actions against the target based on the results of that join. For example, you can use the MERGE statement to perform the given operations below.

What is MERGE query?

A merge query creates a new query from two existing queries. One query result contains all columns from a primary table, with one column serving as a single column containing a relationship to a secondary table. The related table contains all rows that match each row from a primary table based on a common column value.

What is the purpose of MERGE?

MERGE statement is used to synchronize two tables by inserting, deleting, and updating the target table rows based on the join condition with the source table.

Is Grant a DDL?

Data Definition Language (DDL) Statements Grant and revoke privileges and roles. Analyze information on a table, index, or cluster.

How do I combine two SQL query results?


  1. To combine two or more SELECT statements to form a single result table, use the set operators: UNION, EXCEPT or INTERSECT.
  2. To keep all duplicate rows when combining result tables, specify the ALL keyword with the set operator clause.

What is MERGE query in Excel?

How do I combine two query results?

In this step, you create the union query by copying and pasting the SQL statements.

  1. On the Create tab, in the Queries group, click Query Design.
  2. On the Design tab, in the Query group, click Union.
  3. Click the tab for the first select query that you want to combine in the union query.

What are the 5 basic SQL commands?

There are five types of SQL commands: DDL, DML, DCL, TCL, and DQL.

  • Data Definition Language (DDL) DDL changes the structure of the table like creating a table, deleting a table, altering a table, etc.
  • Data Manipulation Language.
  • Data Control Language.
  • Transaction Control Language.
  • Data Query Language.

How can I merge two MySQL tables?

but replace MYNAME with your username and PASS with your password.

  • replace TABLE1 with the table name you are trying to merge.
  • Hit the Enter key.
  • Repeat for any other tables you want to merge.
  • Is there limit to num of columns in MySQL?

    MySQL has hard limit of 4096 columns per table, but the effective maximum may be less for a given table. The exact column limit depends on several factors: The maximum row size for a table constrains the number (and possibly size) of columns because the total length of all columns cannot exceed this size.

    How to merge two SQLite databases?

    Click on Create Second Database button. You will see the second SQLite database created in local folder. (This PC > C > Users > [Your User Name] > AppData > Local > Packages > [App package name] > LocalState) Finally Click on Merge two databases button, you will see the values from second database merged into first database.

    What is the use of merge command in SQL?

    and updating the target table rows based on the join condition with the source table.

  • Syntax of MERGE. Below is the syntax of the MERGE statement in SQL Server.
  • Using MERGE to update matched rows.
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