Any column that is not modified retains its original values, except in certain queries using the CASE expression. See CASE expression for a description of CASE expressions. To add, drop, or modify a ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

To write a basic SQL query to retrieve data, you can use the SELECT statement. ```sql SELECT column1, column2 FROM table_name WHERE condition; ``` - `SELECT`: Specifies the columns you want to ...

To write a basic SQL query to retrieve data, you can use the SELECT statement. ```sql SELECT column1, column2 FROM table_name WHERE condition; ``` - `SELECT`: Specifies the columns you want to ...