Re: [SQL] question on passing parameter in sql query

On 2/7/07, Karthikeyan Sundaram <skarthi98(at)hotmail(dot)com> wrote:
>
> I don't want to compare with Oracle and postgres. But I have a
> situation.
> I am using psql command line tool supplied by postgres.
>
> In Oracle I can say
>
> select * from emp where emp_id = &1
>
> Oracle will ask:
> Enter a value for 1:
>
> If I enter 10, then Oracle will get the empid=10
>
> What is the equal command in postgres ?
>

It can be done, but it is a bit "different" and this method is UNIX
dependent:

test=# create table data (x integer not null primary key);
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "data_pkey"
for table "data"
CREATE TABLE
test=# insert into data values (1),(2),(3),(4);
INSERT 0 4
test=# \set foo `head -1`
3
test=# \echo :foo
3
test=# select * from data where x = :foo;
x
---
3
(1 row)

I don't believe it automatically prompts the way Oracle does. It would be
nice if there was a built-in "\prompt [VARIABLE] [TEXT]".

--
Chad
http://www.postgresqlforums.com/