Re: How to implent the CONVERT ( data_type [ ( length ) ] , expression ) function in PostgreSQL

On 11/02/2014 06:13 AM, Emanuel Calvo wrote:
>
> El 02/11/14 a las 07:15, rohtodeveloper escibió:
>> Dear
>>
>> I'm doing a job about converting an expression of one data type to
>> another.
>> In SQLServer, there'are two functions to do this job.
>>
>
>From which data_type to which one?  In psql, the option \dC, will give
> you the list of supported casts.
>
> Did you try the cast operand?
>
> postgres=# select '1235'::int , 823::text, (now()::date)::text;
>   int4 | text |    now
> ------+------+------------
>   1235 | 823  | 2014-11-02
> (1 row)

In addition if you are trying to do this in/to a table column there is:

http://www.postgresql.org/docs/9.3/interactive/sql-altertable.html

ALTER [ COLUMN ] column_name [ SET DATA ] TYPE data_type [ COLLATE
collation ] [ USING expression ]


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--
Adrian Klaver
adrian.klaver@aklaver.com