A full join returns all the rows from both tables, and fills the missing values with NULLs. It is also known as a full outer join. For example, if you want to get the customer name and the order ...

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 ...

If a column is already in the table, you can change the following column attributes using the MODIFY clause: length, informat, format, and label. The values in a table are either truncated or padded ...