Constraints specify rules for the data in a table’s fields. We have already discussed two of the constraints, NOT NULL and DEFAULT. In this post we will look at four more, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK.
So, you don’t have a scanner, but you need to sign a simple form so you can email the form to a form recipient. You know you don’t scan anything unless you have to, and you are sure that you won’t scan anything for a long time to come. 433 more words
EXTON OpSuS 13.1 KDE is based on openSUSE 13.1, released 20131119. EXTON OpSuS KDE uses kernel 3.11.6 and KDE 4.11.3. Installed programs: Among many other programs, Firefox, Thunderbird, FileZilla, Gimp, Vlc, Network Manager, Samba client, GParted and LibreOffice. 172 more words