I want to update a table with postgresql.
In fact, I have a table (TABLE_ONE) with two column (old_id and new_id). I have a second table (TABLE_TWO) with colums (id,column1,column2,...).
I want to update the column id from TABLE_TWO. The wanted behavior is that when TABLE_ONE.id = TABLE_TWO.old_id, we set id to new_id.
How can i do that?
You want an UPDATE FROM statement:
UPDATE table_one
SET table_one.id = table_two.id
FROM table_two
WHERE table_one.id = table_two.old_id;
Related
I have a table af with columns af.id, etc. and a table af_pb with columns af_id and pb_id (which assigns entities from table pb to the entities of table af).
What i want:
add a new column precedence in table af
for each af.id in af:
if there is a pair (af_id, pb_id) with af.id = af_id and some pb_id in the join table af_pb, then set af.precedence = 0
if there is no such pair, set af.precedence = 1
How can i reach this in PostgreSQL? I already read about the case-when-else-statement but I didn't managed to implement it such that the column precedence is set correctly.
While this can be done in with a case expression, it is not necessary. If you want a default value for later inserts into table af then alter the table with it, then update to set the non-default.
alter table af add column precedence integer default 1;
update af
set precedence = 0
where exists (select null
from af_pb
where af.af_id = af_pb.af_id);
If a default is not desired then a just add the column and afterward update to set the appropriate value:
alter table af add column precedence integer;
update af
set precedence =
( not (exists (select null
from af_pb
where af.af_id = af_pb.af_id)))::integer;
I have the following code in Postgres
select op.url from identity.legal_entity le
join identity.profile op on le.legal_entity_id =op.legal_entity_id
where op.global_id = '8wyvr9wkd7kpg1n0q4klhkc4g'
which returns 1 row.
Then I try to update the url field with the following:
update identity.profile
set url = 'htpp:sam'
where identity.profile.url in (
select op.url from identity.legal_entity le
join identity.profile op on le.legal_entity_id =op.legal_entity_id
where global_id = '8wyvr9wkd7kpg1n0q4klhkc4g'
);
But the above ends up updating more than 1 row, actually all of the rows of the identity table.
I would assume since the first postgres statement returns one row, only one row at most can be updated, but I am getting the wrong effect where all of the rows are being updated. Why ?? Please help a nubie fix the above update statement.
Instead of using profile.url to identify the row you want to update, use the primary key. That is what it is there for.
So if the primary key column is called id, the statement could be modified to:
UPDATE identity.profile
SET ...
WHERE identity.profile.id IN (SELECT op.id FROM ...);
But you can do this much simpler in PostgreSQL with
UPDATE identity.profile op
SET url = 'htpp:sam'
FROM identity.legal_entity le
WHERE le.legal_entity_id = op.legal_entity_id
AND le.global_id = '8wyvr9wkd7kpg1n0q4klhkc4g';
I need to update a few thousand rows in my Postgres table using the result of a array_agg and spatial lookup.
The query needs to take the geometry of the parent table, and return an array of the matching row IDs in the other table. It may return no IDs or potentially 2-3 IDs.
I've tried to use an UPDATE FROM but I can't seem to pass into the subquery the parent table geom column for the SELECT. I can't see any way of doing a JOIN between the 2 tables.
Here is what I currently have:
UPDATE lrc_wales_data.records
SET lrc_array = subquery.lrc_array
FROM (
SELECT array_agg(wales_lrcs.gid) AS lrc_array
FROM layers.wales_lrcs
WHERE st_dwithin(records.geom_poly, wales_lrcs.geom, 0)
) AS subquery
WHERE records.lrc = 'nrw';
The error I get is:
ERROR: invalid reference to FROM-clause entry for table "records"
LINE 7: WHERE st_dwithin(records.geom_poly, wales_lrcs.geom, 0)
Is this even possible?
Many thanks,
Steve
Realised there was no need to use SET FROM. I could just use a sub query directly in the SET:
UPDATE lrc_wales_data.records
SET lrc_array = (
SELECT array_agg(wales_lrcs.gid) AS lrc
FROM layers.wales_lrcs
WHERE st_dwithin(records.geom_poly, wales_lrcs.geom, 0)
)
WHERE records.lrc = 'nrw';
Is it possible to update a row in two tables in Postgresql?
The table names are patron and cir_transaction
The column name is patron_id
I need to update the same rows of patron_id which is present in both above tables
I wrote like below
update patron p, cir_transaction c
set patron_id = '4BW14MBA10'
where patron_id = '4BW14MBA10 ' and c.patron_id = patron_id
Hi I have a temp table (#temptable1) and I want to add a column from another temp table (#temptable2) into that, my query is as follows:
select
Customer
,CustName
,KeyAccountGroups
,sum(Weeksales) as Weeksales
into #temptable1
group by Customer
,CustName
,KeyAccountGroups
select
SUM(QtyInvoiced) as MonthTot
,Customer
into #temptalbe2
from SalesSum
where InvoiceDate between #dtMonthStart and #dtMonthEnd
group by Customer
INSERT INTO #temptable1
SELECT MonthTot FROM #temptable2
where #temptable1.Customer = #temptable2.Customer
I get the following: Column name or number of supplied values does not match table definition.
In an INSERT statement you cannot reference the table you are inserting into. An insert works under the assumption that a new row is to be created. That means there is no existing row that could be referenced.
The functionality you are looking for is provided by the UPDATE statement:
UPDATE t1
SET MonthTot = t2.MonthTot
FROM #temptable1 t1
JOIN #temptable2 t2
ON t1.Customer = t2.Customer;
Be aware however, that this logic requires the Customer column in t2 to be unique. If you have duplicate values in that table the query will seem to run fine, however you will end up with randomly changing results.
For more details on how to combine two tables in an UPDATE or DELETE check out my A Join A Day - UPDATE & DELETE post.
If I understand it correctly you want to do two things.
1: Alter table #temptable1 and add a new column.
2: Fill that column with the values of #temptable2
ALTER #temptable1 ADD COLUMN MothTot DATETIME
UPDATE #temptable1 SET MothTot = (
SELECT MonthTot
FROM #temptable2
WHERE #temptable2.Customer = #temptable1.Customer)