Is it possible to express 1 or 0 as a bit when used as a field value in a select statement?
e.g.
In this case statement (which is part of a select statement) ICourseBased is of type int.
case
when FC.CourseId is not null then 1
else 0
end
as IsCoursedBased
To get it to be a bit type I have to cast both values.
case
when FC.CourseId is not null then cast(1 as bit)
else cast(0 as bit)
end
as IsCoursedBased
Is there a short hand way of expressing the values as bit type without having to cast every time?
(I'm using MS SQL Server 2005)
8条答案
按热度按时间pxq42qpu1#
The CAST spec is "CAST (expression AS type)". The CASE is an expression in this context.
If you have multiple such expressions, I'd declare bit vars @true and @false and use them. Or use UDFs if you really wanted...
eoigrqb62#
You might add the second snippet as a field definition for ICourseBased in a view.
btxsgosb3#
No, but you could cast the whole expression rather than the sub-components of that expression. Actually, that probably makes it less readable in this case.
fhity93d4#
Slightly more condensed than gbn's:
Assuming
CourseId
is non-zeroCOALESCE
is like anISNULL()
, but returns the first non-Null.A Non-Zero
CourseId
will get type-cast to a 1, while a nullCourseId
will cause COALESCE to return the next value, 0bkhjykvo5#
If you want the column is BIT and NOT NULL, you should put ISNULL before the CAST.
2ekbmq326#
The expression to use inside SELECT could be
sqougxex7#
Unfortunately, no. You will have to cast each value individually.
7uhlpewt8#
Tested and functional