Float and double

Hi, a have a problem with float data type

i enter this code

create table #a(f float, d double)    
insert into #a values(20350.35, 20350.35)    
select * from #a

I see a different result in column f and d

f                d
20350.349609375 20350.35

i use SQL Anywhere 12. in early versions, such as ASA 8 was float_as_double option, that can solve this problem

is it bug?

data-type bug

asked 06 Jun '12, 01:13

Sergey
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accept rate: 0%

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One Answer:

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It is by design - cf. the v11.0.0 "SQL Anywhere deprecated and discontinued features" docs - to cite:

float_as_double

In SQL Anywhere, the FLOAT keyword never behaves like Adaptive Server Enterprise's FLOAT keyword when a precision is not specified. SQL Anywhere does not treat FLOAT values the same as DOUBLE values.

For Open Client and jConnect connections, this behavior is different from the default behavior in previous releases.

When unloading or connecting to older databases with materialized views, the setting of this option is ignored.

Without that option, a FLOAT without precision is equivalent to the REAL data type and requires 4 bytes of storage, whereas a DOUBLE requires 8 bytes.

So I guess you ought to bring the datatypes into line (or use FLOAT with an explicit precision, such as FLOAT(53) - that should be identical to DOUBLE).

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answered 06 Jun '12, 04:11

Volker Barth
40.2k●361●550●822
accept rate: 34%

edited 06 Jun '12, 04:24

i read about that, but unfortunately I do not have access to source code and I can not change table definition. it is temporary table, that creates inside program ((

(06 Jun '12, 04:22) Sergey

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question asked: 06 Jun '12, 01:13

question was seen: 15,081 times

last updated: 06 Jun '12, 04:24

SAP SQL Anywhere

Float and double

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