Question

How to set multiple constraints.

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SID -- A string of four characters in length, student I.D. How could I specify the following constraints:
1) The string has exact four character long,
2) The first character of the string has to be 'S',
3) The other characters have to be numeric.
Can you set it as primary key and unique?

Email -- is an email address, I know how to  hold up to 30 characters but how can u make it contain a '@' character with it as well?

And this what have done so far,
CREATE TABLE Student
(
SID
Name varchar(10) not null,
BirthDate DATE not null,
Email

);

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