Hi sorry I could not find a way to best title what I am looking for.
Anyway I have an idea of how to do something but I just need a new pair of eyes to look at what I am trying to do to see if it is possible. I basically have two tables one which has a load of text and numbers and another one which acts like a master table so if anything is found in the second table use that otherwise only use what is found in the first table. However I am unsure how to complete the select statement for this, I know i can go down the route of doing two separate select statements and union them up together but there must be an easier way. After playing around I have a query which I think may work but I am unsure if I have missed something. For example we have Table A and Table B (B holding the master data)
SELECT DISTINCT
A.ID,
COALESCE(B.PROD, A.PROD) AS PROD
COALESCE(B.TEXT1, A.TEXT1) AS TEXT1,
COALESCE(B.NUMBER, A.NUMBER) AS NUMBER
FROM
TABLEA A
FULL OUTER JOIN TABLEB B ON A.PROD = B.PROD
Now what I want is the statement to pick up the following information
Anything found in Table A but not in Table B
Anything found in Table B not in Table A
Anything in Table B as the master which is found in
in Table A
I added a full outer join as there maybe items in table B not in Table A
Will the query work, i have checked against out data and it seems to work however I am not sure if i have missed something.
Thanks
Related
i have an issue with a sql query and how the output is being displayed, you see, i have 3 tables and have at least one field in common, the thing is when i join 2 tables together the information i need is displayed properly, but when i join the third the output goes insane and duplicates the results way too much and i need to figure out why it is happening, down below i'll show you all the tables and relations between each other
this is how the tables are related to each other
This is how the first table (dbo_predios) is made the first three fields are the only relevant in this case
This is how the second table (dbo_permisos_obras_mayores) is made the first three fields are the only relevant in this case as well, the second two can match the first table (dbo_predios)
And here is how the third table (dbo_recepciones_obras_mayores) is made, the fourth field is the only relevant in this case, it could relate to the second table (dbo_permisos_obras_mayores) to the same name field
okay, now that is structurewise, now the query i'm executing is the following:
SELECT
dbo_predios.codigo_unico_predio,
dbo_permisos_obras_mayores.numero_permiso_edificacion,
dbo_permisos_obras_mayores.fecha_permiso_edificacion
FROM dbo_predios
INNER JOIN dbo_permisos_obras_mayores ON dbo_predios.codigo_manzana_predio = dbo_permisos_obras_mayores.codigo_manzana_predio AND dbo_predios.codigo_lote_predio = dbo_permisos_obras_mayores.codigo_lote_predio
INNER JOIN dbo_recepciones_obras_mayores ON dbo_permisos_obras_mayores.numero_recepcion_permiso = dbo_recepciones_obras_mayores.numero_recepcion_permiso
WHERE dbo_permisos_obras_mayores.codigo_manzana_predio = 9402 AND dbo_permisos_obras_mayores.codigo_lote_predio = 30
And the result of executing the query in that way is this:
Later on i did some trial and error and removed the second inner join line, and the result surprised me, here is what happened:
Conclusion: in brief the third table is causing the cartesian product, why? i wish i knew why, what do you think of this particular case? i'd thank any help you could give me, thanks in advance.
Here's the solution - since you are saying that the numero_recepcion_permiso is blank, just add the condition to the inner join, to exclude empty ones:
SELECT
dbo_predios.codigo_unico_predio,
dbo_permisos_obras_mayores.numero_permiso_edificacion,
dbo_permisos_obras_mayores.fecha_permiso_edificacion
FROM dbo_predios
INNER JOIN dbo_permisos_obras_mayores ON dbo_predios.codigo_manzana_predio = dbo_permisos_obras_mayores.codigo_manzana_predio AND dbo_predios.codigo_lote_predio = dbo_permisos_obras_mayores.codigo_lote_predio
INNER JOIN dbo_recepciones_obras_mayores ON dbo_permisos_obras_mayores.numero_recepcion_permiso = dbo_recepciones_obras_mayores.numero_recepcion_permiso
AND dbo_recepciones_obras_mayores.numero_recepcion_permiso <>''
WHERE dbo_permisos_obras_mayores.codigo_manzana_predio = 9402 AND dbo_permisos_obras_mayores.codigo_lote_predio = 30
With that said, should that field allowed to be blank or NULL? Perhaps you need to add a constraint to your table to prevent that scenario. Another suggestion - why did you choose NUMERIC(18,0) as the data type on the primary key for those tables? I would prefer a simple INT or BIGINT and maybe let the database generate the sequence for me.
Okay, i did what Icarus told me and i figured out something that is useful, you see, i made a big mistake and the number combination i was trying out didn't have a numero_recepcion_permiso so the output column is completely blank, however when there is an actual numero_recepcion_permiso it shows correctly, anyway i still need that doesn't output that much amount of repeated rows, how can i fix that? thank y'all for your help so far
First of all, make sure that both values exist in both fields and they actually match or else could generate that amount of repeated rows, however the amount of rows repeated is something i can't tell since i don't know what your actual data is, but that may clear up a Little bit that issue
So I need to figure out how to insert into a table, from another table, with a where clause that requires me to access the table that I am inserting into. I tried an alias from the table I am inserting into, but I quickly found out that you cannot do that. Basically, what I want to check is that the values that I am inserting into the table match a particular field within the table that I am inserting into. Here is what I've tried:
INSERT INTO "USER"."TABLE1" AS A1
SELECT *
FROM "USER"."TABLE2" AS A2
WHERE A2."HIERARCHYLEVEL" = 2
AND A2."PARENT" = A1."INSTANCE"
Obviously, this was to no avail. I've tried a couple other queries, but they didn't me anywhere, either. Any help would be much appreciated.
EDIT:
I would like to add rows to this table, not add columns to the table. The two tables are of the exact same structure -- in fact, I extracted the data already in table1 from table2. What I have in table1 currently is a bunch of records who have NO PARENT, but an instance. What I want to add is all the records who have a parent in table2 that are equal to the instance in table 1.
Currently there is no way to join on a table when inserting. The solution with the subselect where you select from the table, is the correct.
Aliasing the table you want to change is only possible with UPDATE, UPSERT and MERGE. For these operations it makes sense, as you need to match a column and then decide if you need to update it or insert something instead. In your example the line from table1 that you match is not relevant, as you don't want to change it, so from the statement point of view it is not really relevant that the table you use in your subselect is the same that the one you insert into.
As alternative, I can suggest you following solution, which is equivalent with yours:
INSERT INTO "user"."table1"
SELECT
A1."ROOT",
A1."INSTANCE",
A1."PARENT",
A1."HIERARCHYLEVEL"
FROM "user"."table2" AS A1
WHERE A1."INSTANCE" in (select "PARENT" from "user"."table1")
AND A2."HIERARCHYLEVEL" = 2
This gave me the answer I was looking for, although I am sure there is an easier -- or more efficient -- way to do it.
INSERT INTO "user"."table1"
SELECT
A1."ROOT",
A1."INSTANCE",
A1."PARENT",
A1."HIERARCHYLEVEL"
FROM "user"."table2" AS A1,
"user"."table1" AS A2
WHERE A1."INSTANCE" = A2."PARENT"
AND A2."HIERARCHYLEVEL" = 2
i got two tables like this:
how can i insert new rows into Table A from Table B matching the given range defined in Table A ?
Even i thought this would be pretty straight-foward i cant find anything about ths -.-
Excuse my bad english and Thank u in advance
First of all, copy Table A to Table A_Ranges. This way it won't interfere with the result data, and you will be able to reuse it in the future.
Once Table A_Ranges is ready, clear table A.
The following will match each record from B, with the appropriate range:
INSERT INTO A(Range_From, Range_To, payload, IDX, Detail)
SELECT A_Ranges.Range_From, A_Ranges.Range_To, A_Ranges.payload, B.IDX, B.Detail
FROM A_Ranges
INNER JOIN B ON B.IDX BETWEEN A_Ranges.Range_From and A_Ranges.Range_To
I have a table with data in it. Generally the values are correct but sometimes we need to modify them. The modifications are saved in a second table.
I wanted to create a query that dynamically replaces the values if they exist in the replacement table.
This is what my query design looks like but it doesn't work:
This is my query code:
SELECT
b.Pos,
b.Posten,
IsNull(c.Wert_Neu, b.Bez1) AS Bez1,
IsNull(c.Wert_Neu, b.Bez2) AS Bez2,
IsNull(c.Wert_Neu, b.Bez3) AS Bez3,
b.Wert,
b.Einheit
FROM
Table_Values b LEFT JOIN
Table_Replacements c ON b.Bez1 = c.Wert_Alt AND b.Bez2 = c.Wert_Alt AND b.Bez3 = c.Wert_Alt
Where is my logical error? It doesn't replace the values. I assume it has something to do with the joins all going there without OR, but OR would be too costly for performance.
Anyone with a better idea?
Looks like what you want to do is to replace each of the values with the one that appears in the replacement table, but you have three separate columns, and each of those three values will have a different corresponding entry in the replacement table. So you will have to link to that table three different times, once for each value, to link to its replacement, something like:
SELECT
b.Pos,
b.Posten,
IsNull(c.Wert_Neu, b.Bez1) AS Bez1,
IsNull(d.Wert_Neu, b.Bez2) AS Bez2,
IsNull(e.Wert_Neu, b.Bez3) AS Bez3,
b.Wert,
b.Einheit
FROM
Table_Values b
LEFT JOIN Table_Replacements c on b.bez1=c.wert_alt
LEFT JOIN Table_Replacements d on b.bez2=d.wert_alt
LEFT JOIN Table_Replacements e on b.bez3=e.wert_alt
It will be important that your replacement table have an index on wert_alt so that those links can be done efficiently.
Another possibility is to actually store the replacement values in your main data table. So the fields in it would be:
bez1
bez1Replacement
bez2
bez2Replacement
...
Maybe have a trigger on the table so that on any insert or update, the trigger looks up each of the three replacement values from the replacement table and adds them to the main data record. That would not be exactly normalized, but it would speed up your query. But, you may not need to do that at all. The above query is probably efficient enough if you do have that index.
There are two Databases, Database A has a table A with columns of id, group and flag. Database B has a table B with columns of ID and flag. Table B is essentially a subset of table A where the group == 'B'.
They are updated/created in odd ways that are outside my understanding at this time, and are beyond the scope of this question (this is not the time to fix the basic setup and practices of this client).
The problem is that when the flag in Table A is updated, it is not reflected in table B, but should be. This is not a time-critical problem, so it was suggested I create a job to handle this. Maybe because it's the end of the week, or maybe because I've never written more than the most basic stored procedure (I'm a programmer, not a DBA), but I'm not sure how to go about this.
At a simplistic level, the stored procedure would be something along of the lines of
Select * in table A where group == B
Then, loop through the resultset, and for each id, update the flag.
But I'm not even sure how to loop in a stored procedure like this. Suggestions? Example code would be preferred.
Complication: Alright, this gets a little harder too. For every group, Table B is in a separate database, and we need to update this flag for all groups. So, we would have to set up a separate trigger for each group to handle each DB name.
And yes, inserts to Table B are already handled - this is just to update flag status.
Assuming that ID is a unique key, and that you can use linked servers or some such to run a query across servers, this SQL statement should work (it works for two tables on the same server).
UPDATE Table_B
SET Table_B.Flag = Table_A.Flag
FROM Table_A inner join Table_B on Table_A.id = Table_B.id
(since Table_B already contains the subset of rows from Table_A where group = B, we don't have to include this condition in our query)
If you can't use linked servers, then I might try to do it with some sort of SSIS package. Or I'd use the method described in the linked question (comments, above) to get the relevant data from Database A into a temp table etc. in Database B, and then run this query using the temp table.
UPDATE
DatabaseB.dbo.Table_B
SET
DatabaseB.dbo.Table_B.[Flag] = DatabaseA.dbo.Table_A.Flag
FROM
DatabaseA.dbo.Table_A inner join DatabaseB.dbo.Table_B B
on DatabaseA.dbo.id = DatabaseB.dbo.B.id
Complication:
For sevaral groups run one such update SQL per group.
Note you can use Flag without []. I'm using the brackets only because of syntax coloring on stackoverflow.
Create an update trigger on table A that pushes the necessary changes to B as A is modified.
Basically (syntax may not be correct, I can't check it right now). I seem to recall that the inserted table contains all of the updated rows on an update, but you may want to check this to make sure. I think the trigger is the way to go, though.
create trigger update_b_trigger
on Table_A
for update
as
begin
update Table_B
set Table_B.flag = inserted.flag
from inserted
inner join Table_B
on inserted.id = Table_B.id
and inserted.group = 'B'
and inserted.flag <> Table_B.flag
end
[EDIT] I'm assuming that inserts/deletes to Table B are already handled and it's just flag updates to Table B that need to be addressed.