问题
I am not able to understand the issue with the following SQL query. I am trying to copy column ABC from table TABLE3 to TABLE1 with TABLE2 having the common column between the two.
UPDATE TABLE1 CS
SET CS.ABC = TC.ABC
WHERE CS.COMMON_COLUMN = (
SELECT CGL.COMMON_COLUMN
FROM TABLE2 CGL,
TABLE3 TC
WHERE CGL.PRD_ID = TC.PRD_ID
AND CGL.PRD_VER = TC.PRD_VER
AND CGL.PY_ID = TC.PY_ID
AND CGL.TPY_ID = TC.TPY_ID
)
I am running into the error:
SQL Error: ORA-00904: "TC"."ABC": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
[edit; Please read the explanation below]
So I have updated the query to make more sense w.r.t my explanation. Table1 and Table2 are connected by 4 columns PRD_ID, PRD_VER, PY_ID and TPY_ID. This combination finds multiple rows in Table2 since it is not unique/primary key combination. For each row retrieved from Table2, the column common_column is what is needed to update Table3 since common_column only associates with one row.
Example.
Table1
PRD_ID, PRD_VER, PY_ID, TPY_ID, COLUMN_USED_FOR_UPDATE
------------------------------------------------------
1 , 1 , 1 ,1 , VALUE1
2 , 3 , 4 , 5 , VALUE2
Table2
PRD_ID, PRD_VER, PY_ID, TPY_ID, COMMON_COLUMN
------------------------------------------------
1 , 1 , 1, 1, A
1 , 1 , 1, 1, B
2, 3 , 4, 5, C
Table 3
COMMON_COLUMN, .... , COLUMN_TO_UPDATE
-------------------------------------------------------
A, ..... , null
B, .... , null
C, .... , null
So after I execute the query, Table3 should look like this:
COMMON_COLUMN, .... , COLUMN_TO_UPDATE
-------------------------------------------------------
A, ..... , VALUE1
B, .... , VALUE1
C, .... , VALUE2
回答1:
I'm guessing that you want
UPDATE table1 cs
SET cs.abc = (SELECT tc.abc
FROM table2 cgl,
table3 tc
WHERE cgl.prd_id = tc.prd_id
AND cgl.prd_ver = tc.prd_ver
AND cgl.py_id = tc.py_id
AND cgl.typ_id = tc.tpy_id
AND cd.common_column = cgl.common_column)
WHERE EXISTS (SELECT 1
FROM table2 cgl,
table3 tc
WHERE cgl.prd_id = tc.prd_id
AND cgl.prd_ver = tc.prd_ver
AND cgl.py_id = tc.py_id
AND cgl.typ_id = tc.tpy_id
AND cd.common_column = cgl.common_column)
Update: Other than the changes to the column and table names, my initial answer appears to work with the sample data you posted. Note that it's always easier to post DDL and DML so that we can reproduce your tables and data rather than having us convert your data to DDL and DML.
If I create your tables and data
SQL> create table table1 (
2 prd_id number,
3 prd_ver number,
4 py_id number,
5 typ_id number,
6 column_used_for_update varchar2(10)
7 );
Table created.
SQL> begin
2 insert into table1 values( 1, 1, 1, 1, 'VALUE1' );
3 insert into table1 values( 2, 3, 4, 5, 'VALUE2' );
4 end;
5 /
PL/SQL procedure successfully completed.
SQL> create table table2 (
2 prd_id number,
3 prd_ver number,
4 py_id number,
5 typ_id number,
6 common_column varchar2(10)
7 );
Table created.
SQL> begin
2 insert into table2 values( 1, 1, 1, 1, 'A' );
3 insert into table2 values( 1, 1, 1, 1, 'B' );
4 insert into table2 values( 2, 3, 4, 5, 'C' );
5 end;
6 /
PL/SQL procedure successfully completed.
SQL> create table table3 (
2 common_column varchar2(10),
3 column_to_update varchar2(10)
4 );
Table created.
SQL> begin
2 insert into table3 values( 'A', null );
3 insert into table3 values( 'B', null );
4 insert into table3 values( 'C', null );
5 end;
6 /
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
Then adjust the table and column names from my initial answer, it appears that the update works correctly
SQL> ed
Wrote file afiedt.buf
1 UPDATE table3 t3
2 SET t3.column_to_update = (
3 SELECT t1.column_used_for_update
4 FROM table2 t2,
5 table1 t1
6 WHERE t1.prd_id = t2.prd_id
7 AND t1.prd_ver = t2.prd_ver
8 AND t1.py_id = t2.py_id
9 AND t1.typ_id = t2.typ_id
10 AND t3.common_column = t2.common_column)
11 WHERE EXISTS ( SELECT 1
12 FROM table2 t2,
13 table1 t1
14 WHERE t1.prd_id = t2.prd_id
15 AND t1.prd_ver = t2.prd_ver
16 AND t1.py_id = t2.py_id
17 AND t1.typ_id = t2.typ_id
18* AND t3.common_column = t2.common_column)
SQL> /
3 rows updated.
SQL> select * from table3;
COMMON_COL COLUMN_TO_
---------- ----------
A VALUE1
B VALUE1
C VALUE2
来源：https://stackoverflow.com/questions/8015201/update-query-oracle