Curious how to accomplish/correct syntax for the following in T-SQL...
Database Name: TestDB
Existing table name: MyTable
Existing Column Names: ID, NameFirst, NameLast, MyDate
Want to add Column: "AvailabilityStat"
With Default Value= "1"
SQLType= "INT"
(the value of this column will either be 1 or 2, so I'm assuming "INT" length will be 1.)
What would be the best/most efficient way to go about this?
~trail
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>the value of this column will either be 1 or 2, so I'm assuming "INT" length will be 1.)
there you are wrong. int will take more that this.
Now it you really are sure to have 2 values only, you might think about using the BIT datatype, which will use 1bit (however 1byte when less than 8 bit fields are defined in the table)
Otherwise, tinyint is also available, using only 1/2 of INT
so using something like..
ALTER TABLE MyTable ADD AvailabilityState TINYINT NOT NULL DEFAULT (1)
would be the best? I have various other UPDATE statements in queries that only will set this column property to 1 or 2. Like an on/off switch. TINYINT gives a field length of 1 so this should probably be best to use right?
thanks
"in the data on the physical disk I mean, so it's more space efficient that the tinyint. " this is only more disk space efficient if you have multiple bit fields.
The first bit field created in a table will allocate 1 byte of storage per records. then subsequent bit columns will utilise the free bits in the byte intill you have more than 8.
so:
Bit Cols Size(Bytes)
1 1
2 1
3 1
...etc....
8 1
9 2
10 2
...etc...
Business Accounts
Answer for Membership
by: angelIIIPosted on 2005-07-15 at 10:52:59ID: 14453343
alter tabel MyTable add AvailabilityState Int NOT NULL default (1)