You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
Use NOT NULL only if the column cannot have a missing value:
When you declare a column as NOT NULL, it should be because it would make no sense
for the row to exist without a value in that column.
Use null to signify a missing value for any data type.