UPDATE the list of columns
Hi, need help with the following:CREATE TABLE tbl_1 (
rec_id NUMBER(9),
col1 NUMBER(9),
col2 NUMBER(9),
col3 NUMBER(9),
col4 NUMBER(9))
/
CREATE TABLE tbl_2 (
rec_id NUMBER(9),
col1 NUMBER(9),
col2 NUMBER(9),
col3 NUMBER(9),
col4 NUMBER(9),
col5 NUMBER(9),
col6 NUMBER(9))
/
INSERT INTO tbl_1
VALUES (101, 11, 21, 31, 41);
INSERT INTO tbl_1
VALUES (102, 12, 22, 32, 42);
INSERT INTO tbl_1
VALUES (103, 13, 23, 33, 43);
INSERT INTO tbl_1
VALUES (104, 14, 24, 34, 44);
INSERT INTO tbl_2
VALUES (101, 1, 1, 1, 1, 1, 1);
INSERT INTO tbl_2
VALUES (102, 1, 1, 1, 1, 1, 1);
INSERT INTO tbl_2
VALUES (103, 1, 1, 1, 1, 1, 1);
INSERT INTO tbl_2
VALUES (104, 1, 1, 1, 1, 1, 1);
INSERT INTO tbl_2
VALUES (105, 1, 1, 1, 1, 1, 1);
COMMIT ;
--Create procedure pr_upd(col_list) passing list of columns which has to be updated in TBL_2 with values from TBL_1
--for example if pr_upd ('col1,col3' ) called then only col1 and col3 updated in tbl_2 (with values from TBL_1)
--After procedure pr_upd ('col1,col3' ) called:
SELECT * FROM TBL_2
REC_ID COL1 COL2 COL3 COL4 COL5 COL6
101 11 1 31 1 1 1
102 12 1 32 1 1 1
103 13 1 33 1 1 1
104 14 1 34 1 1 1
105 1 1 1 1 1 1
You will need to use dynamic SQL statements. Something like
CREATE OR REPLACE PROCEDURE pr_upd( p_col_list in varchar2 )
AS
l_sql varchar2(1000);
BEGIN
l_sql :=
'UPDATE tbl_2 ' ||
' SET (' || p_col_list || ') = ' ||
' (SELECT ' || p_col_list ||
' FROM tbl_1 ' ||
' WHERE tbl_1.rec_id = tbl_2.rec_id )' ||
' WHERE EXISTS ( ' ||
' SELECT 1 ' ||
' FROM tbl_1 ' ||
' WHERE tbl_1.rec_id = tbl_2.rec_id )' ;
EXECUTE IMMEDIATE l_sql;
END;
which product
SQL> CREATE OR REPLACE PROCEDURE pr_upd( p_col_list in varchar2 )
2 AS
3 l_sql varchar2(1000);
4 BEGIN
5 l_sql :=
6 'UPDATE tbl_2 ' ||
7 ' SET (' || p_col_list || ') = ' ||
8 ' (SELECT ' || p_col_list ||
9 ' FROM tbl_1 ' ||
10 ' WHERE tbl_1.rec_id = tbl_2.rec_id )' ||
11 ' WHERE EXISTS ( ' ||
12 ' SELECT 1 ' ||
13 ' FROM tbl_1 ' ||
14 ' WHERE tbl_1.rec_id = tbl_2.rec_id )' ;
15 EXECUTE IMMEDIATE l_sql;
16 END;
17 /
Procedure created.
SQL> exec pr_upd ('col1,col3' );
PL/SQL procedure successfully completed.
SQL> select * from tbl_2;
REC_ID COL1 COL2 COL3 COL4 COL5 COL6
---------- ---------- ---------- ---------- ---------- ---------- ----------
101 11 1 31 1 1 1
102 12 1 32 1 1 1
103 13 1 33 1 1 1
104 14 1 34 1 1 1
105 1 1 1 1 1 1
SQL>
Justin
Tags: Database
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