Oracle-L: RE: ** is there PL/SQL for case

From: Igor Neyman <ineyman_at_perceptron.com>
Date: Thu, 07 Aug 2003 13:39:24 -0800
Message-ID: <F001.005C9853.20030807133924@fatcity.com>

To overcome this in PL/SQL you can run sql, which includes "case", as "dynamic sql":

EXECUTE IMMEDIATE 'SELECT .' Igor Neyman, OCP DBA

ineyman_at_perceptron.com

-----Original Message-----

Guang Mei
Sent: Thursday, August 07, 2003 4:24 PM
To: Multiple recipients of list ORACLE-L

Below is an example (with Oracle 8173), "case" works in sql, not in pl/sql.

Guang

YPD_OWNER_at_essex-SQL> create table t1 (name varchar2(30), salary number );

Table created.

YPD_OWNER_at_essex-SQL> insert into t1 (name,salary) values ('Bill', 1000);

1 row created.

YPD_OWNER_at_essex-SQL> insert into t1 (name,salary) values ('George', 2000);

1 row created.

YPD_OWNER_at_essex-SQL> insert into t1 (name,salary) values ('Gore', 3000);

1 row created.

YPD_OWNER_at_essex-SQL> insert into t1 (name,salary) values ('Dick', 4000);

1 row created.

YPD_OWNER_at_essex-SQL> commit;

Commit complete.

YPD_OWNER_at_essex-SQL> select * from t1;

NAME                               SALARY


------------------------------ ----------

Bill                                 1000
George                               2000
Gore                                 3000
Dick                                 4000

YPD_OWNER_at_essex-SQL> select count(case when salary < 2000 then 1 else null end) poor,

count(case when salary between 2000 and 3000 then 1 else null end) middle_class,

count(case when salary > 3000 then 1 else null end) rich from t1;

POOR MIDDLE_CLASS RICH
---------- ------------ ----------

1 2 1

YPD_OWNER_at_essex-SQL> declare

  c1 number;
  c2 number;
  c3 number;

begin
select count(case when salary < 2000 then 1 else null end) poor,

count(case when salary between 2000 and 3000 then 1 else null end) middle_class,

count(case when salary > 3000 then 1 else null end) rich into c1,c2,c3
from t1;
end;
/

select count(case when salary < 2000 then 1 else null end) poor,

*
ERROR at line 6:

ORA-06550: line 6, column 16:
PLS-00103: Encountered the symbol "CASE" when expecting one of the
following:

( * - + all mod null <an identifier>
<a double-quoted delimited-identifier> <a bind variable> avg count current distinct max min prior sql stddev sum unique variance execute forall time timestamp interval date <a string literal with character set specification> <a number> <a single-quoted SQL string>

-----Original Message-----

Joshi
Sent: Thursday, August 07, 2003 4:55 PM
To: Multiple recipients of list ORACLE-L

Guang,

Thanks for your help. Do you have an example you can send me. I thought whatever one can do in sql one can do in pl/sql. meaning sql is a subset of pl/sql. Correct me if i am wrong. Thank You.

Guang Mei <gmei_at_incyte.com> wrote:

I am not sure in 9i. But in 8i I think you can use "case" in sql but not in pl/sql. You have to use if elsif in pl/sql.

Guang

-----Original Message-----

Joshi
Sent: Thursday, August 07, 2003 4:24 PM
To: Multiple recipients of list ORACLE-L

Hi,

Is there a statement in pl/SQL like case or is if elsif the only way. Meaning if I need to transalate state depending on input number as follows :

1 - CA

2 - OR

3 - WA

4 - AR

Can I have one statement like case 'state# :

state := 'CA'
state := 'OR'

etc.

or do i have to do :

IF state# = 1 THEN

state := 'CA';

ELSIF state# = 2 THEN

state := 'OR';

etc

Thank You.

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Author: Igor Neyman
  INET: ineyman_at_perceptron.com

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Received on Thu Aug 07 2003 - 16:39:24 CDT