How to generate the SQL statement

Hello

Here is the table and the data, and I did the solution using a pl/sql cursor.
This is possible in a SQL statemnt?




create the table TEMP_DISTINCT
(
NUMBER of allocation A_ID not null,
B_ID NUMBER not null,
C_VAL VARCHAR2 (30)
)


INSERT INTO TEMP_DISTINCT(A_ID,B_ID,C_VAL) VALUES(111,2222,'One')
INSERT INTO TEMP_DISTINCT(A_ID,B_ID,C_VAL) VALUES(111,2222,'Two')
INSERT INTO TEMP_DISTINCT(A_ID,B_ID,C_VAL) VALUES(112,2222,'Three')
INSERT INTO TEMP_DISTINCT(A_ID,B_ID,C_VAL) VALUES(112,2222,'Four')
INSERT INTO TEMP_DISTINCT(A_ID,B_ID,C_VAL) VALUES(112,2221,'Five')
INSERT INTO TEMP_DISTINCT(A_ID,B_ID,C_VAL) VALUES(112,2221,'Six')


declare
vorgid varchar2 (30);
CUR cursor is
Select distinct A_ID, B_ID from TEMP_DISTINCT
order by A_ID, B_ID;
Start
for the curs in news
loop
Select C_VAL
in TEMP_DISTINCT vorgid
where curs. A_ID = A_ID
and curs. B_ID = B_ID
and rownum = 1;

dbms_output.put_line (curs. A_ID | ' : ' || curs. B_ID | ':' || substr (vorgid, 1, 22));
end loop;
end;

Output
-------------
111: 2222:One
112: 2221:Five
112: 2222:Three

Hello

When you use ROWNUM directly on a table or a set of view or a result that is not an ORDER BY clause, results are for an indefinite period, in other words, there is no guarantee that you will get the same results every time that you run the query, even if the table has not changed.

The ROW_NUMBER analytic function can be used instead of ROWNUM. ROW_NUMBER can be calculated several different sequences (on different partitions of the result set) at the same time, like this:

WITH    got_rnum    AS
(
    SELECT  a_id
    ,       b_id
    ,       c_val
    ,       ROW_NUMBER () OVER  (PARTITION BY  a_id, b_id
                                 ORDER BY      ROWID
                                )   AS rnum
    FROM    temp_distinct
)
SELECT  a_id
,       b_id
,       c_val
FROM    got_rnum
WHERE   rnum    = 1
;

When you use ROW_NUMBER, you have to ORDER SOMETHING. In a very small table, like the sample, arbitrary results could come in the ROWID in your PL/SQL code order, so I used "ORDER OF ROWID" above. I could have used a constant, for example "ORDER OF 0.

Tags: Database

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