Sql updating joined tables Noth east tharapas in delhi sexy

Posted by / 14-Nov-2019 22:54

Sql updating joined tables

For each row in the countries table, the LEFT JOIN clause finds the matching rows in the locations table.

The region_id column in the countries table is the link between the countries and regions table.On clause specifies the column names to find matching rows between both tables using Inner Join.SET specifies the Table2 column Name will be updated with values of Table1 name column.The country_id column in the locations table is the foreign key that links to the country_id column in the countries table.To query the country names of US, UK, and China, you use the following statement.

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In case there is no matching row found e.g., with the country_id CN, the row in the countries table is included in the result set and the row in the locations table is filled with NULL values.