How do I MERGE two tables in the same column in SQL?

How do I MERGE two tables in SQL?

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.

How do I MERGE two tables with the same column name?

When two tables use the same column name(s), use table_name. column_name or table_alias. column_name format in SELECT clause to differentiate them in the result set. Use INNER JOIN whenever possible because OUTER JOIN uses a lot more system resources and is much more slower.

How do I join two tables in two SQL columns?

If you'd like to get data stored in tables joined by a compound key that's a primary key in one table and a foreign key in another table, simply use a join condition on multiple columns. In one joined table (in our example, enrollment ), we have a primary key built from two columns ( student_id and course_code ).

How can I MERGE two tables in SQL without same columns?

Using the “FROM Table1, Table2” Syntax One way to join two tables without a common column is to use an obsolete syntax for joining tables. With this syntax, we simply list the tables that we want to join in the FROM clause then use a WHERE clause to add joining conditions if necessary.