I am new to Oracle technology. Earlier I posted 2 posts for the same issue due to lack of understanding the requirement.
Table 1:
MSGID
-----
1,2,3
2,3
4
null
null
Table 2:
MID MSGDESC
---- -------
1 ONE
2 TWO
3 THREE
4 FOUR
Expected output:
XCOL DESC
----- -----
1,2,3 ONE,TWO,THREE
2,3 TWO,THREE
4 FOUR
I am not able to fulfil this requirement. Please provide me one solution.
Note: tables don't have any unique or primary key values. Table 1 has 5000 records and table 2 only has 80 records with descriptions.
create table Table1 (MSGID varchar2(100));
insert into Table1 values ('1,2,3');
insert into Table1 values ('2,3');
insert into Table1 values ('4');
insert into Table1 values (null);
insert into Table1 values (null);
create table Table2 (MID varchar2(100), MSGDESC varchar2(100));
insert into Table2 values ('1','ONE');
insert into Table2 values ('2','TWO');
insert into Table2 values ('3','THREE');
insert into Table2 values ('4','FOUR');
select
msgid as xcol,
"DESC",
col1, col2, ..., col12
from
Table1
left join (
select
msgid,
wm_concat(msgdesc) as "DESC"
from
(
select
msgid,
msgdesc
from
(select distinct msgid from Table1 where ...)
cross join (
select level as occ from dual connect by level <= 100)
)
left join Table2
on mid = regexp_substr(msgid, '[^,]+', 1, occ)
where
occ <= regexp_count(msgid, ',') + 1
order by msgid, occ
)
group by msgid
) using (msgid)
Related
I would like to insert data in to two tables. Will be one-to-many connection. For this, I have to use Foreign Key, of course.
I think, table1 - ID column is an ideal for this a Primary Key. But I generate it always with a trigger, automatically, every line. SO,
How can I put Table1.ID (auto generated, Primary Key) column in to table2.Fkey column in the same insert query?
INSERT ALL INTO table1 ( --here (before this) generated the table1.id column automatically with a trigger.
table1.food,
table1.drink,
table1.shoe
) VALUES (
'apple',
'water',
'slippers'
)
INTO table2 (
fkey,
color
) VALUES (
table1.id, -- I would like table2.fkey == table1.id this gave me error
'blue'
) SELECT
*
FROM
table1
INNER JOIN table2 ON table1.id = table2.fkey;
The error message:
"00904. 00000 - "%s: invalid identifier""
As suggested by #OldProgrammer, use sequence
INSERT ALL INTO table1 ( --here (before this) generated the table1.id column automatically with a trigger.
table1_id,
table1.food,
table1.drink,
table1.shoe
) VALUES (
<sequecename_table1>.nextval,
'apple',
'water',
'slippers'
)
INTO table2 (
fkey,
color
) VALUES (
<sequecename_table2>.nextval,
<sequecename_table1>.currval, -- returns the current value of a sequence.
'blue'
) SELECT
*
FROM
table1
INNER JOIN table2 ON table1.id = table2.fkey;
Since you're using Oracle DB's 12c version, then might use Identity Column Property. Then easily return the value of first table's (table1) to a local variable by charging of returning clause just after an insert statement for table1, and use inside the next insert statement which is for table2 as stated below :
SQL> create table table1(
2 ID integer generated always as identity primary key,
3 food varchar2(50), drink varchar2(50), shoe varchar2(50)
4 );
SQL> create table table2(
2 fkey integer references table1(ID),
3 color varchar2(50)
4 );
SQL> declare
2 cl_tab table1.id%type;
3 begin
4 insert into table1(food,drink,shoe) values('apple','water','slippers' )
5 returning id into cl_tab;
6 insert into table2 values(cl_tab,'blue');
7 end;
8 /
SQL> select * from table1;
ID FOOD DRINK SHOE
-- ------- ------- -------
1 apple water slippers
SQL> select * from table2;
FKEY COLOR
---- --------------------------------------------------
1 blue
Anytime you issue the above statement for insertions between begin and end, both table1.ID and table2.fkey columns will be populated by the same integer values. By the way do not forget to commit the changes by insertions, if you need these values throughout the DB(i.e.from other sessions also).
I have two tables Table1 and Table2 both with the same columns TestResult and Testcounts. Table1 has testresult as varchar and Table2 has testresult as number.
I have a string .for eg "Oracle" as value for testresult of varchar type for Table1 which needs to be inserted to testresult of number type of Table2 as null.How can i do this? Any suggestions will be highly appreciated :)
EDIT
I have table1 with columns as TestResult varchar2(50) and Testcount number with values as "0.5","0.6","0.8","Oracle" for TestResult and 1,2,3,4 for Testcount.
Now i have another table Table2 as TestResult number and Testcount number with no values, in other words its empty.. I would like to insert all data from table1 to table2 with "Oracle" being inserted as "null"
The following will do what you've asked for:
INSERT INTO TABLE2 (TESTRESULT, TESTCOUNTS)
SELECT CASE
WHEN LENGTH(REGEXP_SUBSTR(TESTRESULT, '[0-9.]*')) = LENGTH(TESTRESULT) THEN TESTRESULT
ELSE NULL
END,
TESTCOUNTS
FROM TABLE1
SQLFiddle here
If you only have a single string value that you can't convert to a number, and you want to set that to null, you can just use a case expression to supply the null:
insert into table2 (testresult, testcounts)
select case when testresult = 'Oracle' then null else to_number(testresult) end,
testcounts
from table1;
Demo:
create table table1 (testresult varchar2(10), testcounts number);
insert into table1
select '0.5', 1 from dual
union all select '0.6', 2 from dual
union all select '0.8', 3 from dual
union all select 'Oracle', 4 from dual;
create table table2 (testresult number, testcounts number);
insert into table2 (testresult, testcounts)
select case when testresult = 'Oracle' then null else to_number(testresult) end,
testcounts
from table1;
select * from table2;
TESTRESULT TESTCOUNTS
---------- ----------
.5 1
.6 2
.8 3
4
db<>fiddle
If you are using Oracle 12c Release 2 (or above) you could also just try to convert the string to a number and use the default ... on conversion error clause to substitute null for that, or any other, non-numeric value:
insert into table2 (testresult, testcounts)
select to_number(testresult default null on conversion error), testcounts
from table1;
select * from table2;
TESTRESULT TESTCOUNTS
---------- ----------
.5 1
.6 2
.8 3
4
In earlier versions you could do the same thing with a user-defined function that wraps the real to_number() call and returns null on error. Or a regex/translate check similar to what #BobJarvis has shown.
Having multiple rows with null would make the data hard to interpret though, so hopefully you only have this one fixed value...
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
I'm looking for a good SQL approach (Oracle database) to fulfill the next requirements:
Delete rows from Table A that are not present in Table B.
Both tables have identical structure
Some fields are nullable
Amount of columns and rows is huge (more 100k rows and 20-30 columns to compare)
Every single field of every single row needs to be compared from Table A against table B.
Such requirement is owing to a process that must run every day as changes will come from Table B.
In other words: Table A Minus Table B => Delete the records from the Table A
delete from Table A
where (field1, field2, field3) in
(select field1, field2, field3
from Table A
minus
select field1, field2, field3
from Table B);
It's very important to mention that a normal MINUS within DELETE clause fails as does not take the nulls on nullable fields into consideration (unknown result for oracle, then no match).
I also tried EXISTS with success, but I have to use NVL function to replace the nulls with dummy values, which I don't want it as I cannot guarantee that the value replaced in NVL will not come as a valid value in the field.
Does anybody know a way to accomplish such thing? Please remember performance and nullable fields as "a must".
Thanks ever
decode finds sameness (even if both values are null):
decode( field1, field2, 1, 0 ) = 1
To delete rows in table1 not found in table2:
delete table1 t
where t.rowid in (select t1.rowid
from table1 t1
left outer join table2 t2
on decode(t1.field1, t2.field1, 1, 0) = 1
and decode(t1.field2, t2.field2, 1, 0) = 1
and decode(t1.field3, t2.field3, 1, 0) = 1
/* ... */
where t2.rowid is null /* no matching row found */
)
to use existing indexes
...
left outer join table2 t2
on (t1.index_field1=t2.index_field1 or
t1.index_field1 is null and t2.index_field1 is null)
and ...
Use a left outer join and test for null in your where clause
delete a
from a
left outer join b on a.x = b.x
where b.x is null
Have you considered ORALCE SQL MERGE statement?
Use Bulk operation for huge number of records. Performance wise it will be faster.
And use join between two table to get rows to be delete. Nullable columns can be compared with some default value.
Also, if you want Table A to be similar as Table B, why don't you truncate table A and then insert data from table b
Assuming you the same PK field available on each table...(Having a PK or some other unique key is critical for this.)
create table table_a (id number, name varchar2(25), dob date);
insert into table_a values (1, 'bob', to_date('01-01-1978','MM-DD-YYYY'));
insert into table_a values (2, 'steve', null);
insert into table_a values (3, 'joe', to_date('05-22-1989','MM-DD-YYYY'));
insert into table_a values (4, null, null);
insert into table_a values (5, 'susan', to_date('08-08-2005','MM-DD-YYYY'));
insert into table_a values (6, 'juan', to_date('11-17-2001', 'MM-DD-YYYY'));
create table table_b (id number, name varchar2(25), dob date);
insert into table_b values (1, 'bob', to_date('01-01-1978','MM-DD-YYYY'));
insert into table_b values (2, 'steve',to_date('10-14-1992','MM-DD-YYYY'));
insert into table_b values (3, null, to_date('05-22-1989','MM-DD-YYYY'));
insert into table_b values (4, 'mary', to_date('12-08-2012','MM-DD-YYYY'));
insert into table_b values (5, null, null);
commit;
-- confirm minus is working
select id, name, dob
from table_a
minus
select id, name, dob
from table_b;
-- from the minus, re-query to just get the key, then delete by key
delete table_a where id in (
select id from (
select id, name, dob
from table_a
minus
select id, name, dob
from table_b)
);
commit;
select * from table_a;
But, if at some point in time, tableA is to be reset to the same as tableB, why not, as another answer suggested, truncate tableA and select all from tableB.
100K is not huge. I can do ~100K truncate and insert on my laptop instance in less than 1 second.
> DELETE FROM purchase WHERE clientcode NOT IN (
> SELECT clientcode FROM client );
This deletes the rows from the purchase table whose clientcode are not in the client table. The clientcode of purchase table references the clientcode of client table.
DELETE FROM TABLE1 WHERE FIELD1 NOT IN (SELECT CLIENT1 FROM TABLE2);
I have two table with the same columns in different databases. Both table have records.i want to insert the records of table2 in table1 but i want to ignore those records which are already in table 1. As well i want to store all ignored records in a new table.
Example:
create table dest
(id number primary key,
col1 varchar2(10));
create table src
(id number,
col1 varchar2(10));
insert into src values(1,'ABC');
insert into src values(2,'GHB');
insert into src values(3,'DUP');
insert into src values(3,'DUP');
commit;
merge into dest
using
(select id,col1 from src) src on(dest.id=src.id)
when not matched then
insert values(src.id,src.col1)
when matched
then update set dest.col1=src.col1;
Error report -
SQL Error: ORA-00001: unique constraint (SCOTT.SYS_C0010807) violated
00001. 00000 - "unique constraint (%s.%s) violated"
*Cause: An UPDATE or INSERT statement attempted to insert a duplicate key.
For Trusted Oracle configured in DBMS MAC mode, you may see
this message if a duplicate entry exists at a different level.
*Action: Either remove the unique restriction or do not insert the key.
you can use intersect and minus to determine the differences
-- Test Data
-- table1#abc
with data1(id,
val) as
(select 1, 'val1'
from dual
union all
select 2, 'val2'
from dual
union all
select 3, 'val3'
from dual),
-- table2#xyz
data2(id,
val) as
(select 1, 'another val1'
from dual
union all
select 2, 'val2'
from dual
union all
select 4, 'val4'
from dual)
-- Intersection
select 'Intersection', intersection.*
from ((select * from data2) intersect (select * from data1)) intersection
union all
-- data2 not in data1
select 'data2 not in data1', d2.*
from ((select * from data2) minus (select * from data1)) d2
union all
-- data1 not in data2
select 'data1 not in datad', d1.*
from ((select * from data1) minus (select * from data2)) d1;