I've a pivot table output and now I want to check for the values from the pivot columns and replace the values if null from another column from another table.
Invoice_No
Column
value
111
A
One
111
B
Two
111
C
Three
111
E
Five
(SELECT Invoice_No, new_value, Column_Name FROM table_name)
PIVOT(max(new_value)
FOR Column_Name IN ('A','B','C','D','E'))
This returned the following table
Invoice_No
'A'
'B'
'C'
'D'
'E'
111
One
Two
Three
null
Five
Now, I want to replace the null value from column D with a value from another table that matches the Invoice_no.
with temp as
(SELECT Invoice_No, new_value, Column_Name FROM table_name)
PIVOT(max(new_value)
FOR Column_Name IN ('A','B','C','D','E'))
select nvl(temp.D,bckup.D)
from
(select A,B,C,D,E from Backup_table) bckup
join
temp
on
temp.Invoice_No = bckup = Invoice_No
Now, I'm getting the error saying D Column does not exist.
Pivot will rename your column as 'D' not D only. So, You need a simple update in your query as -
WITH temp AS(SELECT *
FROM(SELECT Invoice_No, new_value, Column_Name
FROM table_name)
PIVOT(max(new_value) FOR Column_Name IN ('A' AS A,'B' AS B,'C' AS C,'D' AS D,'E' AS E)
)
SELECT NVL(temp.D,bckup.D)
FROM(SELECT A,B,C,D,E
FROM Backup_table) bckup
JOIN temp ON temp.Invoice_No = bckup.Invoice_No
Related
As the title says, I am looking for a way to remove all rows from TableA where there is a matching row in TableB.
the Tables A & B have about 30 columns in them so a WHERE A.col1 = B.col1 etc would be a little problematical. Ideally I was hoping for something like
DELETE FROM tableA WHERE IN TableB
(overly simplified by this type of thing)
IN clause can compare all columns returned from select
DELETE FROM tableA WHERE ( col1,col2,col3,.. ) IN ( select col1,col2,col3... FROM TableB );
The brute force way to establish if two records from each table are the same is to just compare every column:
DELETE
FROM tableA a
WHERE EXISTS (SELECT 1 FROM tableB b WHERE a.col1 = b.col1 AND a.col2 = b.col2 AND ...
a.col30 = b.col30);
You could create function which checks structures of tables and, if they are the same, creates string containing correct conditions to compare.
For example here are two tables:
create table t1 (id, name, age) as (
select 1, 'Tom', 67 from dual union all
select 2, 'Tia', 42 from dual union all
select 3, 'Bob', 16 from dual );
create table t2 (id, name, age) as (
select 1, 'Tom', 51 from dual union all
select 3, 'Bob', 16 from dual );
Now use function:
select generate_condition('T1', 'T2') from dual;
result:
T1.ID = T2.ID and T1.NAME = T2.NAME and T1.AGE = T2.AGE
Copy this, paste and run delete query:
delete from t1 where exists (select 1 from t2 where <<PASTE_HERE>>)
Here is the function, adjust it if needed. I used user_tab_columns so if tables are on different schemas you need all_tab_columns and compare owners too. If you have Oracle 11g you can replace loop with listagg(). Second table has to contain all columns of first table and they have to be same type and length.
create or replace function generate_condition(i_t1 in varchar2, i_t2 in varchar2)
return varchar2 is
v varchar2(1000) := '';
begin
for rec in (select column_name, u2.column_id
from user_tab_cols u1
left join (select * from user_tab_cols where table_name = i_t2) u2
using (column_name, data_type, data_length)
where u1.table_name = i_t1 order by u1.column_id)
loop
if rec.column_id is null then
v := 'ERR: incompatible structures';
goto end_loop;
end if;
v := v||' and '||i_t1||'.'||rec.column_name
||' = '||i_t2||'.'||rec.column_name;
end loop;
<< end_loop >>
return(ltrim(v, ' and '));
end;
If you want to avoid running process manually you need dynamic PL/SQL.
create table tableA (a NUMBER, b VARCHAR2(5), c INTEGER);
create table tableB (a NUMBER, b VARCHAR2(5), c INTEGER);
As you said
WHERE A.col1 = B.col1 etc would be a little problematical
you could intersect the tables and mention all columns from tableA one time, like this:
delete tableA
where (a,b,c) in (select * from tableA
intersect
select * from tableB);
I've got a table as follows
Table1
ID Name Tag
-----------------
1 N1 2.1
2 N2 3.5
3 N1 3.5
4 N3 8.1
I create a new table Table2 with ID and Name (unique constraint) and I want to insert Table1's contents into Table2 avoiding duplicates, in the sense that I want only 1, 2 and 4 from Table1 in Table2.
I've tried this but it doesn't seem to work and I get the unique constraint error (ORACLE SQL)
INSERT INTO TABLE2 (ID, NAME)
SELECT ID, NAME
FROM TABLE1
WHERE NAME NOT IN (SELECT NAME FROM TABLE2);
Please can someone point me in the right direction?
Sorry for not making myself clear. Table2 is a brand new table. I want the first values inserted, the following duplicates should be ignored. So in my case, N1, N2 get inserted, N1 is dupe so it is ignored, N3 is inserted
OK - from your description, I understand table t2 is currently empty, and you want to copy the rows where id is in (1, 2, 4) from table t1 to table t2.
Why your code fails:
You seem to believe that the condition is applied to the first row in t1, it passes so it is inserted into t2, then the condition is applied to the second row in t1 (using what is already inserted in t2), etc. - and you don't understand why there is any attempt to insert ALL the rows from t1 into t2. Why doesn't the third row fail the WHERE clause?
Good question! The reason is that operations are done on a SET basis. The WHERE condition uses table t2 AS IT WAS before the INSERT operation began. So for ALL rows, the WHERE clause compares to an empty table t2.
How to fix this... Decide which id you want to add when there are duplicate names. For example, one way to get the result you said you wanted is to select MIN(id) for each name. Moreover, you still want to check if the name exists in t2 already (since you may do this again in the future, when t2 is already partially populated).
insert into t2 ( id, name )
select min(id), name
from t1
where name not in (select name from t2)
group by name
;
You can try it bother....!
Insert into tb2(Field1, Field2)
SELECT Field1, Field2
FROM tb1
WHERE NOT EXISTS (SELECT Field1 FROM tb1) ;
This is how I understood the question:
SQL> create table table2
2 (id number,
3 name varchar2(2),
4 tag number,
5 constraint pk_t2 primary key (id, name)
6 );
Table created.
SQL>
SQL> insert into table2 (id, name, tag)
2 with test (id, name, tag) as
3 (select 1, 'N1', 2.1 from dual union
4 select 2, 'N2', 3.5 from dual union
5 select 3, 'N1', 3.5 from dual union
6 select 4, 'N3', 8.1 from dual
7 )
8 select min(id), name, max(tag)
9 from test
10 group by name;
3 rows created.
SQL>
SQL> select * from table2 order by id;
ID NA TAG
---------- -- ----------
1 N1 3,5
2 N2 3,5
4 N3 8,1
SQL>
When we need to unique any two or more column we have to create unique index.
Run this query
ALTER TABLE TABLE2 ADD UNIQUE unique_index( id, name);
and then
INSERT INTO TABLE2 (id,name,tag) VALUES(1, "N1", 3.5 )
ON DUPLICATE KEY UPDATE tag=3.5
this will also help to update new tag
Try to check if the id and name from Table1 is doesn't exist in Table2, if then insert.
If the unique constraint on TABLE2 is a composite key then run this:
INSERT INTO TABLE2 (ID, NAME)
SELECT A.ID, A.NAME
FROM TABLE1 A
WHERE NOT EXISTS (SELECT NULL FROM TABLE2 B WHERE A.ID=B.ID AND A.NAME=B.NAME);
If there are two unique constraints; one on the id, and the other on the name then run this instead:
INSERT INTO TABLE2 (ID, NAME)
SELECT A.ID, A.NAME
FROM TABLE1 A
WHERE NOT EXISTS (SELECT NULL FROM TABLE2 B WHERE A.ID=B.ID OR A.NAME=B.NAME);
ORACLE, in case you need to get values from 2 different tables.
below example,i use an increment case.
INSERT INTO TABLE1
(INDEX, REMARKS, NAME, AGE)
(SELECT (SELECT colescs(MAX(INDEX),0) FROM TABLE1)+1,
'any remarks',
t2.NAME, t2,age from TABLE2 t2 where t2.name = 'apple')
explanation
match below numbers (1)-(1), (2)-(2) ...
INSERT INTO TABLE1
(INDEX, //index increment (1)
REMARKS, //hard code (2)
NAME, //from table2 (3)
AGE) //from table2 (4)
(SELECT // this part is to get values from another table
(SELECT colescs(MAX(INDEX),0) FROM TABLE1)+1, //increment (1)
'any remarks', //hard code value (2)
t2.NAME, //from table2 (3)
t2,age //from table2 (4)
from TABLE2 t2 where t2.name = 'apple') //condition for table2
Im trying to insert a record into my table. But there is 1 column in which I want to get concatenated results of 2 select statements. Like the 2 statements will fetch their records and concatenate to form 1 value so that it can be inserted into the column.
insert into ABC (Name,City,Age)
Values ('John',(
(Select City from TableA where ID=1)concat(Select City from TableA where ID=2)),'22')
Or it can be comma separated but I am not getting what to use here.
Try this one:
INSERT INTO ABC (Name, City, Age)
VALUES ('John',
(
(SELECT City FROM TableA WHERE ID = 1) ||
(SELECT City FROM TableA WHERE ID = 2)
),
'22');
But ensure ... WHERE ID = 1 and ....WHERE ID = 2 return one row.
Using a cross join to select from the two tables produces a nice clear statement:
insert into ABC (Name,City,Age)
select 'John', concat(t1.city, t2.city), 22
from TableA t1
cross join TableA t2
where t1.ID = 1
and t2.ID = 2
/
Use CONCAT() or CONCAT_WS() functions for this (reference)
insert into ABC (Name,City,Age) Values (
'John',
CONCAT_WS(' ', (Select City from TableA where ID=1), (Select City from TableA where ID=2)),
'22'
)
I have a table table1 below is how the data looks like.
Column1 is my foreign key of another table.
Column1 Column2 Column3
1 A 06/MAY/14
1 A 05/MAY/14
1 B 06/MAY/14
1 B 01/JAN/00
1 A 01/JAN/00
Now i want to find distinct column1 values where it meets the following condition.
1.atleast one record where column2 should be A and column3 should be (sysdate - 1)
AND
2.atleast one record where column2 should be B and column3 should be (sysdate - 1)
Meaning alteast one A and B should have their column 3 populated with (sysdate - 1)
I have written the below query, please tell if i'm doing anything wrong.
I also want to know if i'm doing the right way of joining. The table contains around 50K records and performance should be fine i guess.
SELECT DISTINCT COLUMN1 FROM
TABLE1 A
JOIN
TABLE1 B ON (A.COLUMN1 = B.COLUMN1)
WHERE
((TRUNC(A.COLUMN3) - TRUNC(A.COLUMN3) = 0)
AND TRUNC(A.COLUMN3) = TRUNC(SYSDATE - 1)
AND TRUNC(B.COLUMN3) = TRUNC(SYSDATE - 1)
AND A.COLUMN2 = 'A'
AND B.COLUMN2 = 'B'
AND TO_CHAR(A.COLUMN3, 'DD-MON-YY') != '01-JAN-00'
AND TO_CHAR(B.COLUMN3, 'DD-MON-YY') != '01-JAN-00'
);
For performance-comparison one with subselects and group:
SELECT COLUMN1 FROM (
SELECT
COLUMN1,
COUNT(COLUMN2) CNT
FROM (
SELECT DISTINCT
COLUMN1,
COLUMN2
FROM TABLE1
WHERE TRUNCATE(COLUMN3) = SYSDATE - 1 AND
(COLUMN2 = 'A' OR COLUMN2 = 'B'))
GOUP BY COLUMN1)
WHERE CNT = 2
This should work
SELECT DISTINCT A.column1 -- Obtain distinct from A
FROM table1 A -- TableA
join table1 B -- TableB
ON A.column1 = B.column1 -- Joining them on Column1
WHERE A.column3 = SYSDATE - 1 -- Yesterdays data on Table A
AND A.column2 = 'A' -- A values
AND B.column2 = 'B'; -- B Values
Note: No distinctness in your test case. So try with a unique key.
I have the following code that works fine in MS SQL Server:
delete grp
from grp
left join my_data
on grp.id1 = my_data.id1
and grp.id2 = my_data.id2
and grp.id3 = my_data.id3
and grp.id4 = my_data.id4
where my_data.id1 is NULL
Basically, I want to delete all occurrence that can be found in grp and don't have any equivalence in my_data. Sadly, it doesn't work in Oracle 10g. I tried using the old syntax for left join (+) but it doesn't work either. Like this:
delete grp
from grp,
my_data
where grp.id1 = my_data.id1 (+)
and grp.id2 = my_data.id2 (+)
and grp.id3 = my_data.id3 (+)
and grp.id4 = my_data.id4 (+)
and my_data.id1 is NULL
A IN clause would works if I didn't have multiple keys but I don't see how I could use it with my data. So, what is the alternative?
Shannon's solution is the way to go: use the operator NOT IN (or NOT EXISTS).
You can however delete or update a join in Oracle, but the synthax is not the same as MS SQL Server:
SQL> DELETE FROM (SELECT grp.*
2 FROM grp
3 LEFT JOIN my_data ON grp.id1 = my_data.id1
4 AND grp.id2 = my_data.id2
5 AND grp.id3 = my_data.id3
6 AND grp.id4 = my_data.id4
7 WHERE my_data.id1 IS NULL);
2 rows deleted
Additionally, Oracle will only let you update a join if there is no ambiguity as to which base row will be accessed by the statement. In particular, Oracle won't risk an update or a delete (the statement will fail) if there is a possibility that a row may appear twice in the join. In this case, the delete will only work if there is a UNIQUE constraint on my_data(id1, id2, id3, id4).
Tables and data:
SQL> create table grp (id1 number null, id2 number null, id3 number null, id4 number null);
Table created.
SQL> create table my_data (id1 number null, id2 number null, id3 number null, id4 number null);
Table created.
SQL> insert into grp values (1, 2, 3, 4);
1 row created.
SQL> insert into grp values (10, 20, 30, 40);
1 row created.
SQL> insert into grp values (1, 2, 30, 40);
1 row created.
SQL> insert into my_data values (1, 2, 3, 4);
1 row created.
SQL> commit;
Commit complete.
Using in. Note Do not use if the IDs in the subquery can be null. Not in of null never returns true.
SQL> delete grp where (id1, id2, id3, id4) not in (select id1, id2, id3, id4 from my_data);
2 rows deleted.
SQL> select * from grp;
ID1 ID2 ID3 ID4
---------- ---------- ---------- ----------
1 2 3 4
Using exists
SQL> rollback;
Rollback complete.
SQL> delete grp where not exists (select * from my_data where grp.id1 = my_data.id1 and grp.id2 = my_data.id2 and grp.id3 = my_data.id3 and grp.id4 = my_data.id4);
2 rows deleted.
SQL> select * from grp;
ID1 ID2 ID3 ID4
---------- ---------- ---------- ----------
1 2 3 4
SQL>
If you want to ensure there is no ambiguity in what's being deleted, you could change Vincent's solution to:
delete from grp where rowid in
(
select
grp.rowid
from
grp left outer join my_data on
grp.id1 = my_data.id1
and grp.id2 = my_data.id2
and grp.id3 = my_data.id3
and grp.id4 = my_data.id4
where
my_data.id1 is NULL
)
Either Vincent's answer https://stackoverflow.com/a/3675205 does not work at all, or it does not work in Oracle 12c. That answer should be improved by specifying the lowest or highest version of Oracle where this works. The proof:
SELECT * FROM v$version where banner like 'Oracle%';
/*
Oracle Database 12c Standard Edition Release 12.2.0.1.0 - 64bit Production
*/
create table a (id int);
create table b (id int);
insert into a select 1 from dual union select 2 from dual;
insert into b select 1 from dual union select 2 from dual union select 3 from dual;
select * from a right join b on b.id = a.id;
/*
1 1
2 2
null 3
*/
delete from (
select b.*
from b
inner join a on a.id = b.id
)
/*
Error at Command Line : 7 Column : 13
Error report -
SQL Error: ORA-01752: cannot delete from view without exactly one key-preserved table
01752. 00000 - "cannot delete from view without exactly one key-preserved table"
*Cause: The deleted table had
- no key-preserved tables,
- more than one key-preserved table, or
- the key-preserved table was an unmerged view.
*Action: Redefine the view or delete it from the underlying base tables.
*/
delete from b
where rowid in (
select b.rowid
from b
inner join a on a.id = b.id
)
/*
2 rows deleted.
*/
select * from a right join b on b.id = a.id
/*
null 3
*/
drop table a;
drop table b;
Bottom line is, use WHERE ROWID IN () at least in 12c.
I can't add a comment because it need 50 reps,so I add a answer here.
I tested Vincent's delete from query, that syntax can't let you delete what you want,at least it's not a common use for all the delete join cases.
At first I create a table using oracle default user scott:
create table emp1 as select * from emp where sal<2000;
I want to delete the records from emp where empno in emp1(just a simple test),so I used this delete from query:
delete from (select a.* from emp a join emp1 b on a.empno=b.empno);
No matter what the table or join order is,left join or inner join,no matter what where clause I use,the sql will delete the corresponding records in emp1.
So I think this delete from query can not let you delete from a specified table.
Loop a cursor will be a better way for these cases.