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When creating a table in SQL SERVER, I want to restrict that the length of an INTEGER column can only be equal 10.
eg: the PhoneNumber is an INTEGER, and it must be a 10 digit number.
How can I do this when I creating a table?
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If you want to limit the range of an integer column you can use a check constraint: create table some_table ( phone_number integer not null check (phone_number between 0 and 9999999999) ); But as R.T. and huMpty duMpty have pointed out: a phone number is usually better stored in a varchar column.
The INTEGER datatype is just a subtype of NUMBER. You can define the column as NUMBER(8,0) to get you an integer column that is <= 8 digits.
Precision is the number of digits in a number. Scale is the number of digits to the right of the decimal point in a number. For example, the number 123.45 has a precision of 5 and a scale of 2. In SQL Server, the default maximum precision of numeric and decimal data types is 38.
If you want to limit the range of an integer column you can use a check constraint:
create table some_table
(
phone_number integer not null check (phone_number between 0 and 9999999999)
);
But as R.T. and huMpty duMpty have pointed out: a phone number is usually better stored in a varchar column.
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