I am coming from a mssql world and moving over to postgres. I am trying to create a new procedure from a query I wrote and it fails on creation. I am using pgAdmin 4 to create the proc and I've tried copy-pasting the query into the "code" tab of the dialog box.
What I'm trying to accomplish is inserting a bunch of rows into a table and outputting the ids from the identity column into a temporary table. I will be using those ids for more work further down the line, but it's failing before it is even usable. The way I did it in MSSQL was I had a table variable and used "output inserted.id" to get those values to insert into the table variable.
From what I understand, I have to create a temp table and use the returning keyword in postgres. The following query works if I run it in a query window
CREATE TEMPORARY TABLE temp_table
(
temp_id integer
);
WITH ROWS AS
(
INSERT INTO table_a
(some_name_a)
SELECT some_name_b
FROM table_b
RETURNING id)
INSERT INTO temp_table(temp_id)
SELECT id FROM ROWS;
But when I try to create the procedure for that I get an error saying
"ERROR: syntax error at or near "CREATE" LINE 3: AS $BODY$CREATE TEMPORARY TABLE temp_table^"
Here is what the create proc code looks like:
CREATE OR REPLACE PROCEDURE public.temp()
LANGUAGE 'plpgsql'
AS $BODY$
CREATE TEMPORARY TABLE temp_table
(
temp_id integer
);
WITH ROWS AS
(
INSERT INTO table_a
(some_name_a)
SELECT some_name_b
FROM table_b
RETURNING id)
INSERT INTO temp_table(temp_id)
SELECT id FROM ROWS;
$BODY$;
I have two tables with two fields each in a PostgreSQL 12.4 database.
table_one (id serial, rec text) - 10 mil recs
table_two (id serial, rec jsonb)
I need to move data from table_one to table_two and transform the text into jsonb.
This method worked fairly well until the number of records got to around 400k.
INSERT INTO table_one(rec) SELECT rec::jsonb FROM table_two;
I tried the following two copy commands, but ran into syntax errors with both
COPY (SELECT item_records::jsonb FROM mdm_impt_json_raw_text) TO mdm_impt_json_raw;
COPY mdm_impt_json_raw(item_records) FROM (SELECT item_records::jsonb FROM mdm_impt_json_raw_text);
Could someone either help me with the syntax errors on the copy commands or suggest a better method for moving the data.
I am practicing with redshift, I have created a table:
Inserted values from another table
Delete the data from table
I have tried rollback both of this steps, but it doesn't work. What is wrong with this, I don't understand?
Open two psql terminals connected to same Redshift intance and database, say terminal-1 and terminal-2.
Execute following queries on terminal-1.
create table sales(
salesid integer not null Identity,
commission decimal(8,2),
saledate date,
description varchar(255),
created_at timestamp default sysdate,
updated_at timestamp);
begin;
insert into sales(commission,saledate,description,created_at,updated_at) values('3.55','2018-12-10','Test description','2018-05-17 23:54:51','2018-05-17 23:54:51');
insert into sales(commission,saledate,description,created_at,updated_at) values('5.67','2018-11-10','Test description1','2018-05-17 23:54:51','2018-05-17 23:54:51');
Hold on here and go to terminal-2; don't close the terminal-1, and execute following query
select * from sales;
You will not get above two data records inserted from terminal-1.
Hold on here, again go to terminal-1; and execute below query.
commit;
Hold on here and go to terminal-2; execute following query again
select * from sales;
Now, you will both records.
Point proven.
I'm not sure if its standard SQL:
INSERT INTO tblA
(SELECT id, time
FROM tblB
WHERE time > 1000)
What I'm looking for is: what if tblA and tblB are in different DB Servers.
Does PostgreSql gives any utility or has any functionality that will help to use INSERT query with PGresult struct
I mean SELECT id, time FROM tblB ... will return a PGresult* on using PQexec. Is it possible to use this struct in another PQexec to execute an INSERT command.
EDIT:
If not possible then I would go for extracting the values from PQresult* and create a multiple INSERT statement syntax like:
INSERT INTO films (code, title, did, date_prod, kind) VALUES
('B6717', 'Tampopo', 110, '1985-02-10', 'Comedy'),
('HG120', 'The Dinner Game', 140, DEFAULT, 'Comedy');
Is it possible to create a prepared statement out of this!! :(
As Henrik wrote you can use dblink to connect remote database and fetch result. For example:
psql dbtest
CREATE TABLE tblB (id serial, time integer);
INSERT INTO tblB (time) VALUES (5000), (2000);
psql postgres
CREATE TABLE tblA (id serial, time integer);
INSERT INTO tblA
SELECT id, time
FROM dblink('dbname=dbtest', 'SELECT id, time FROM tblB')
AS t(id integer, time integer)
WHERE time > 1000;
TABLE tblA;
id | time
----+------
1 | 5000
2 | 2000
(2 rows)
PostgreSQL has record pseudo-type (only for function's argument or result type), which allows you query data from another (unknown) table.
Edit:
You can make it as prepared statement if you want and it works as well:
PREPARE migrate_data (integer) AS
INSERT INTO tblA
SELECT id, time
FROM dblink('dbname=dbtest', 'SELECT id, time FROM tblB')
AS t(id integer, time integer)
WHERE time > $1;
EXECUTE migrate_data(1000);
-- DEALLOCATE migrate_data;
Edit (yeah, another):
I just saw your revised question (closed as duplicate, or just very similar to this).
If my understanding is correct (postgres has tbla and dbtest has tblb and you want remote insert with local select, not remote select with local insert as above):
psql dbtest
SELECT dblink_exec
(
'dbname=postgres',
'INSERT INTO tbla
SELECT id, time
FROM dblink
(
''dbname=dbtest'',
''SELECT id, time FROM tblb''
)
AS t(id integer, time integer)
WHERE time > 1000;'
);
I don't like that nested dblink, but AFAIK I can't reference to tblB in dblink_exec body. Use LIMIT to specify top 20 rows, but I think you need to sort them using ORDER BY clause first.
If you want insert into specify column:
INSERT INTO table (time)
(SELECT time FROM
dblink('dbname=dbtest', 'SELECT time FROM tblB') AS t(time integer)
WHERE time > 1000
);
This notation (first seen here) looks useful too:
insert into postagem (
resumopostagem,
textopostagem,
dtliberacaopostagem,
idmediaimgpostagem,
idcatolico,
idminisermao,
idtipopostagem
) select
resumominisermao,
textominisermao,
diaminisermao,
idmediaimgminisermao,
idcatolico ,
idminisermao,
1
from
minisermao
You can use dblink to create a view that is resolved in another database. This database may be on another server.
insert into TABLENAMEA (A,B,C,D)
select A::integer,B,C,D from TABLENAMEB
If you are looking for PERFORMANCE, give where condition inside the db link query.
Otherwise it fetch all data from the foreign table and apply the where condition.
INSERT INTO tblA (id,time)
SELECT id, time FROM dblink('dbname=dbname port=5432 host=10.10.90.190 user=postgresuser password=pass123',
'select id, time from tblB where time>'''||1000||'''')
AS t1(id integer, time integer)
I am going to SELECT Databasee_One(10.0.0.10) data from Database_Two (10.0.0.20)
Connect to 10.0.0.20 and create DBLink Extenstion:
CREATE EXTENSION dblink;
Test the connection for Database_One:
SELECT dblink_connect('host=10.0.0.10 user=postgres password=dummy dbname=DB_ONE');
Create foreign data wrapper and server for global authentication:
CREATE FOREIGN DATA WRAPPER postgres VALIDATOR postgresql_fdw_validator;
You can use this server object for cross database queries:
CREATE SERVER dbonepostgres FOREIGN DATA WRAPPER postgres OPTIONS (hostaddr '10.0.0.10', dbname 'DB_ONE');
Mapping of user and server:
CREATE USER MAPPING FOR postgres SERVER dbonepostgres OPTIONS (user 'postgres', password 'dummy');
Test dblink:
SELECT dblink_connect('dbonepostgres');
Import data from 10.0.0.10 into 10.0.0.20
INSERT INTO tableA
SELECT
column1,
,column2,
...
FROM dblink('dbonepostgres', 'SELECT column1, column2, ... from public.tableA')
AS data(column1 DATATYPE, column2 DATATYPE, ...)
;
Here's an alternate solution, without using dblink.
Suppose B represents the source database and A represents the target database:
Then,
Copy table from source DB to target DB:
pg_dump -t <source_table> <source_db> | psql <target_db>
Open psql prompt, connect to target_db, and use a simple insert:
psql
# \c <target_db>;
# INSERT INTO <target_table>(id, x, y) SELECT id, x, y FROM <source_table>;
At the end, delete the copy of source_table that you created in target_table.
# DROP TABLE <source_table>;
I'm trying to figure out how to insert a .JPG file into a SQL Server 2000 database field of type image using Transact SQL. Thanks.
Use OPENROWSET:
INSERT MyTable (ImageColumnName)
SELECT BulkColumn FROM OPENROWSET (BULK 'c:\myjpeg.jpg', SINGLE_BLOB) AS X
EDITED Whoops, you're using 2000--the previous solution is not supported. You have to use WRITETEXT:
CREATE TABLE MyTable
(
ID INT PRIMARY KEY IDENTITY (1,1),
ImageColumnName IMAGE NULL
)
GO
-- must insert a dummy value into the image column for TEXTPTR
-- to work in next bit
DECLARE #RowId INT
INSERT MyTable (ImageColumnName) VALUES (0xFFFFFFFF)
SELECT #RowId = SCOPE_IDENTITY()
-- get a pointer value to the row+column you want to
-- write the image to
DECLARE #Pointer_Value varbinary(16)
SELECT #Pointer_Value = TEXTPTR(ImageColumnName)
FROM MyTable
WHERE Id = #RowId
-- write the image to the row+column pointer
WRITETEXT MyTable.ImageColumnName #Pointer_Value 'c:\myjpeg.jpg'
There is a tool called textcopy.exe
You can find it under MSSQL\Binn or get it with SQL Server 2000 SP4
Alexander Chigrik wrote a nice stored procedure for usinig it with SQL query:
http://www.mssqlcity.com/Articles/KnowHow/Textcopy.htm
The stored procedure found in this tutorial worked for me:
Brief tutorial on text, ntext, and image