Specifies whether the column can accept NULL values. Columns that do not allow NULL values can be added only if they have a default specified. If the new column allows NULL values and no default is ...

Contribute to arunkumareswari/sql development by creating an account on GitHub. Skip to content. Navigation Menu Toggle navigation. Sign in Product GitHub Copilot. Write better code with AI Security.

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 ...