Getting maximum value of float in SQL programmatically
Though there doesn't appear to be any inline way to get the min or max values, there's a solution somebody put together:
CREATE TABLE datatype_extrema
(min_bit bit NOT NULL DEFAULT (0) CHECK (min_Bit=0)
,max_bit AS CAST(0x1 AS bit)
,min_tinyint AS CAST(0x00 AS tinyint)
,max_tinyint AS CAST(0xFF AS tinyint)
,min_smallint AS CAST(0x8000 AS smallint)
,max_smallint AS CAST(0x7FFF AS smallint)
,min_int AS CAST(0x80000000 AS int)
,max_int AS CAST(0x7FFFFFFF AS int)
,min_bigint AS CAST(0x8000000000000000 AS bigint)
,max_bigint AS CAST(0x7FFFFFFFFFFFFFFF AS bigint)
,min_float AS CAST('-1.79E+308' AS float)
,max_float AS CAST('1.79E+308' AS float)
,min_real AS CAST('-3.40E+38' AS real)
,max_real AS CAST('3.40E+38' AS real)
,min_smalldatetime AS CAST('19000101 00:00' AS smalldatetime)
,max_smalldatetime AS CAST('20790606 23:59' AS smalldatetime)
,min_datetime AS CAST('17530101 00:00:00.000' AS datetime)
,max_datetime AS CAST('99991231 23:59:59.997' AS datetime)
)
INSERT INTO datatype_extrema DEFAULT VALUES
GO
CREATE TRIGGER nochange_datatype_extrema
ON datatype_extrema INSTEAD OF INSERT, UPDATE, DELETE
AS BEGIN
RAISERROR ('No changes allowed for table datatype_extrema.', 16, 1)
ROLLBACK TRANSACTION
END
GO
After that, you can either copy a maximum value to a local variable or (when using queries) cross join with this table.
Declare @max_int int
Set @max_int=(SELECT max_int FROM datatype_extrema)
IF COALESCE(@FirstInt, @max_int) < COALESCE(@SecondInt, 0)
Here are the defaults for the float and real type (that's missing in the accepted answer):
select
CAST('-1.79E+308' AS float) as MinFloat,
CAST('1.79E+308' AS float) as MaxFloat,
CAST('-3.40E+38' AS real) as MinReal,
CAST('3.40E+38' AS real) as MaxReal
Unfortunately it is not possible to convert them from a varbinary, but varchar works without any problems.