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 ...

SQL is the leading language for developing and querying databases, but it has a few quirks.In my last article, I shared 7 SQL mistakes to avoid.Now, let’s take a look at 9 best practices for ...

Use the UPDATE statement to add values to the new column(s). Changing Column Attributes If a column is already in the table, you can change the following column attributes using the MODIFY clause: ...