Postgresql:
I have two tables 'abc' and 'xyz' in postgresql. Both tables have same 'id' columns which type is 'serial primary key;'.
abc table id column values are 1,2,3 and also xyz id column containing same values 1,2,3,4
I want to union both tables with 'union all' constraint. But I want to change 'xyz' id column values to next value of 'abc' id column last value as 1,2,3,4,5,6,7
select id from abc
union all
select id from xyz
|id|
1
2
3
1
2
3
4
my wanted resuls as
|id|
1
2
3
4
5
6
7
BETTER - Thanks to #CaiusJard
This should do it for you
select id FROM abc
UNION ALL select x.id + a.maxid FROM xyz x,
(SELECT MAX(id) as maxid from abc) a
ORDER BY id
For anyone who's doing something like this:
I had a similar problem to this, I had table A and table B which had two different serials. My solution was to create a new table C which was identical to table B except it had an "oldid" column, and the id column was set to use the same sequence as table A. I then inserted all the data from table B into table C (putting the id in the oldid field). Once I fixed the refernces to point to from the oldid to the (new)id I was able to drop the oldid column.
In my case I needed to fix the old relations, and needed it to remain unique in the future (but I don't care that the ids from table A HAVE to all be before those from table C). Depending on what your trying to accomplish, this approach may be useful.
If anyone is going to use this approach, strictly speaking, there should be a trigger to prevent someone from manually setting an id in one table to match another. You should also alter the sequence to be owned by NONE so it's not dropped with table A, if table A is ever dropped.
Related
I have two SQL tables, example below:
Table 1 (column types varchar, integer, numeric)
A
B
C
D
A007
22
14.02
_Z 1
A008
36
15.06
_Z 1
Table 2 (column types varchar)
A
B
C
D
A009,A010,A011
33,35,36
16.06,17.06
_Z 1,_Z 2
A003,A007,A009
14,22,85
13.01,17.05,14.02
_Z 1
Is there a way to compare individual rows of the first table with the rows of the second table and find out which row of the first table does not occur in the values of any row of the second table?
As can be seen, the first row of table 1 occurs in the values of the second row of table 2.
However, the second row of table 1 does not occur in the values of the rows of table 2, therefore the desired output is row 2 of table 1.
Desired output table:
A
B
C
D
A008
36
15.06
_Z 1
What I have tried so far:
My solution was to create a table containing all possible combinations of column values for each row of the second table (with the same column data types as the columns of the first table) and then use SELECT * FROM TABLE1 EXCEPT SELECT * FROM TABLE2 to get the difference rows.
The solution worked (for relatively small tables) but I am currently in a situation where generating all combinations of column values for each row of the second table (which in my case has 500 rows) results in a table containing millions of rows, so I am looking for another solution, where I can use the original table with 500 rows.
Thank you in advance for any possible answer, preferably one that could also work in the IBM DB2 database.
We can use a LIKE trick here along with string concatenation:
SELECT t1.*
FROM Table1 t1
WHERE NOT EXISTS (
SELECT 1
FROM Table2 t2
WHERE ',' || t2.A || ',' LIKE '%,' || t1.A || ',%'
);
Note that it would be a preferable table design for Table2 to not store CSV values in this way. Instead, get every A value onto a separate row.
I'm creating a new table using PostgreSQL, but I need to get a parameter from another table as an input.
This is the table I have (I called table_1):
id column_1
1 100
2 100
3 100
4 100
5 100
I want to create a new table, but only using ids that are higher than the highest id from the table above (table_1). Something like this:
insert into table_new
select id, column_1 from table_old
where id > (max(id) from table_1)
How can I do this? I tried searching, but I got to several posts like https://community.powerbi.com/t5/Desktop/M-Query-Create-a-table-using-input-from-another-table/td-p/209923, Take one table as input and output using another table BigQuery and sql query needs input from another table, which are not exactly what I need.
Just use where id > (select max(id) from table_1).
I am working in phpMyadmin using SQL.
I want to take the primary key (EntryID) from TableA and create a cartesian product (if I am using the term correctly) in TableB (empty table already created) for all entries which share the same value for FieldB in TableA, except where TableA.EntryID equals TableA.EntryID
So, for example, if the values in TableA were:
TableA.EntryID TableA.FieldB
1 23
2 23
3 23
4 25
5 25
6 25
The result in TableB would be:
Primary key EntryID1 EntryID2 FieldD (Default or manually entered)
1 1 2 Default value
2 1 3 Default value
3 2 1 Default value
4 2 3 Default value
5 3 1 Default value
6 3 2 Default value
7 4 5 Default value
8 4 6 Default value
9 5 4 Default value
10 5 6 Default value
11 6 4 Default value
12 6 5 Default value
I am used to working in Access and this is the first query I have attempted in SQL.
I started trying to work out the query and got this far. I know it's not right yet, as I’m still trying to get used to the syntax and pieced this together from various articles I found online. In particular, I wasn’t sure where the INSERT INTO text went (to create what would be an Append Query in Access).
SELECT EntryID
FROM TableA.EntryID
TableA.EntryID
WHERE TableA.FieldB=TableA.FieldB
TableA.EntryID<>TableA.EntryID
INSERT INTO TableB.EntryID1
TableB.EntryID2
After I've got that query right, I need to do a TRIGGER query (I think), so if an entry changes it's value in TableA.FieldB (changing it’s membership of that grouping to another grouping), the cartesian product will be re-run on THAT entry, unless TableB.FieldD = valueA or valueB (manually entered values).
I have been using the Designer Tab. Does there have to be a relationship link between TableA and TableB. If so, would it be two links from the EntryID Primary Key in TableA, one to each EntryID in TableB? I assume this would not work because they are numbered EntryID1 and EntryID2 and the name needs to be the same to set up a relationship?
If you can offer any suggestions, I would be very grateful.
Research:
http://www.fluffycat.com/SQL/Cartesian-Joins/
Cartesian Join example two
Q: You said you can have a Cartesian join by joining a table to itself. Show that!
Select *
From Film_Table T1,
Film_Table T2;
No, you don't want a cartesian product where you join tables without any condition. What you are looking for is a simple self join:
insert into TableB(EntryID1, EntryID2)
select x.EntryID, y.EntryID
from TableA x
join TableA y on x.FieldB = y.FieldB and x.EntryID <> y.EntryID;
EDIT: As you want this table to be up-to-date all the time, consider a view instead of a table (only, then you could not have a manually maintained FieldD).
This should give you the 'cartesian' (its not actually a cartesian, as #ThorstenKettner mentions below - its a self join) you're after, and insert it into TableB:
INSERT INTO TableB (EntryId1, EntryId2, fieldD)
SELECT a.EntryID, b.EntryID, 'Default Value'
FROM TableA a, TableA b
WHERE a.FieldB=b.FieldB
AND a.EntryID<>b.EntryID
You don't need any relationship between the two tables for the Trigger, although I would suggest you have a foreign key relationship setup anyway, so that you never get an entry in TableB.EntryID1 or TableB.EntryID2 that doesn't have a corresponding entry in TableA.EntryID..
For the Triggers, you'd do something like this for the insert (you don't need to check TableB in this case because you know that your new TableA.EntryId doesn't exist there yet:
CREATE TRIGGER ins_tableA AFTER INSERT ON TableA
FOR EACH ROW
BEGIN
INSERT INTO TableB (EntryId1, EntryId2, fieldD)
SELECT a.EntryID, b.EntryID, 'Default Value'
FROM TableA a, TableA b
WHERE a.FieldB=b.FieldB
AND a.EntryID=NEW.EntryID
AND a.EntryID<>b.EntryID;
END;
And for the update, you could delete all the corresponding rows from TableB first, and then re-run the insert. Something like this:
CREATE TRIGGER upd_tableA AFTER UPDATE ON TableA
FOR EACH ROW
BEGIN
DELETE FROM TableB b
WHERE b.EntryId1 = NEW.EntryId
OR b.EntryId2 = NEW.EntryId;
INSERT INTO TableB (EntryId1, EntryId2, fieldD)
SELECT a.EntryID, b.EntryID, 'Default Value'
FROM TableA a, TableA b
WHERE a.FieldB=b.FieldB
AND a.EntryID=NEW.EntryID
AND a.EntryID<>b.EntryID;
END;
None of this is tested I'm afraid, but hopefully it'll put you on the right track..
Database: Oracle
I want to insert data from table 1 to table 2 but the catch is, primary key of table 2 is the combination of first 4 letters and last 4 numbers of the primary key of table 1.
For example:
Table 1 - primary key : abcd12349887/abcd22339887/abcder019987
In this case even if the primary key of table 1 is different, but when I extract the 1st 4 and last 4 chars, the output will be same abcd9887
So, when I use select to insert data, I get error of duplicate PK in table 2.
What I want is if the data of the PK is already present then don't add that record.
Here's my complete stored procedure:
INSERT INTO CPIPRODUCTFAMILIE
(productfamilieid, rapport, mesh, mesh_uitbreiding, productlabelid)
(SELECT DISTINCT (CONCAT(SUBSTR(p.productnummer,1,4),SUBSTR(p.productnummer,8,4)))
productnummer,
ps.rapport, ps.mesh, ps.mesh_uitbreiding, ps.productlabelid
FROM productspecificatie ps, productgroep pg,
product p left join cpiproductfamilie cpf
on (CONCAT(SUBSTR(p.productnummer,1,4),SUBSTR(p.productnummer,8,4))) = cpf.productfamilieid
WHERE p.productnummer = ps.productnummer
AND p.productgroepid = pg.productgroepid
AND cpf.productfamilieid IS NULL
AND pg.productietype = 'P'
**AND p.ROWID IN (SELECT MAX(ROWID) FROM product
GROUP BY (CONCAT(SUBSTR(productnummer,1,4),SUBSTR(productnummer,8,4))))**
AND (CONCAT(SUBSTR(p.productnummer,1,2),SUBSTR(p.productnummer,8,4))) not in
(select productfamilieid from cpiproductfamilie));
The highlighted section seems to be wrong, and because of this the data is not picking up.
Please help
Try using this.
p.productnummer IN (SELECT MAX(productnummer) FROM product
GROUP BY (CONCAT(SUBSTR(productnummer,1,4),SUBSTR(productnummer,8,4))))
I have two tables looking like this:
A B
id_attr value id id_attr value
-------------- -------------------
1 a 1 2 b
2 b 1 3 c
3 c 2 2 b
4 NULL 2 4 d
2 5 e
3 1 aaa
3 3 c
Table A is my reference table and I have multiple entries in table B. (every group of entries with the same id cosists of pairs of (id_attr,value) similiar to structure of table A). Goal is to check if entry in table A matches any of the entries in table B (one or more). One entry matches another when every attribute existing in table B under one id matches similiar attributes in table A. Also, in table A values could be NULL, but in table B not.
In example above my query should return "1", becouse only entries with id 1 fully match similiar entries in table A. Id 2 doesn't match, becouse in table A value of attribute 4 is NULL and it has an attribute which doesn`t exist in table A. Id 3 doesn't match either even if attribute 3 is similiar, but attribute 1 doesn't match.
As you can see to achieve a match not every one of the entries existing in table A should be matching, but if an attribute exists in table B then it value has to match similiar value in table A.
What is the most efficient way to achieve this result in an Oracle query?
Every help would be greatly appreciated. I can provide answers to further questions if I didn't express myself clear enough.
You can try the following:
SELECT ID, MIN(IS_OK) FROM
(
SELECT B.ID ID,
DECODE(B.VALUE, A.VALUE, 'Y', 'N') IS_OK
FROM A INNER JOIN B
ON B.ID_ATTR = A.ID_ATTR
)
GROUP BY ID;
Which will return you B's ID and a flag that indicates whether this ID is OK or not.
(Note that Decode will properly take care of the null values comparison without having to test for null values)