when doing INSERT INTO ... SELECT ... to load data from a table from another one. Does the INSERT start before the end of the SELECT?
example: INSERT INTO films SELECT * FROM tmp_films WHERE date_prod < '2004-05-07';
First, the data is collected from the SELECT query. Afterwards, this data is given to the INSERT statement.
Also check out the docs here: SQL-INSERT
Related
I had accidentally deleted most of the rows in my Postgres table (data is not important its in my test environment, but I need a dummy data to be insert in to these table).
Let us take three tables,
MAIN_TABLE(main_table_id, main_fields)
ADDRESS_TABLE(address_table_id, main_table_id, address_type, other_fielsds)
CHAID_TABLE(chaid_table_id,main_table_id, shipping_address_id, chaild_fields)
I had accidentally deleted most of the data from ADDRESS_TABLE.
ADDRESS_TABLE has a foreign key from MAIN_TABLE ,i.e. main_table_id. for each row in MAIN_TABLE there is two entries in ADDRESS_TABLE, in which one entry is its address_type is "billing/default" and other entry is for address_type "shipping".
CHAID_TABLE has two foreign keys one from MAIN_TABLE, i.e. main_table_id and other from ADDRESS_TABLE i.e., shipping_address_id. this shipping_address_id is address id of ADDRESS_TABLE, its address_type is shipping and ADDRESS_TABLE.main_table_id = CHAID_TABLE.main_table_id.
These are the things that I needed.
I need to create two dummy address entries for each raw in MAIN_TABLE one is of address type "billing/default" and other is of type "shipping".
I need to insert address_table_id to the CHAID_TABLE whose ADDRESS_TABLE.main_table_id = CHAID_TABLE.main_table_id. and addres_type ="shipping"
if first is done I know how to insert second, because it is a simple insert query. I guess.
it can be done like,
UPDATE CHAID_TABLE
SET shipping_address_id = ADDRESS_TABLE.address_table_id
FROM ADDRESS_TABLE
WHERE ADDRESS_TABLE.main_table_id = CHAID_TABLE.main_table_id
AND ADDRESS_TABLE.addres_type ='shipping';
for doing first one i can use loop in psql, ie loop through all the entries in MAIN_TABLE and insert two dummy rows for each rows. But I don't know how to do these please help me to solve this.
I hope your solution is this, Create a function that loop through all the rows in MAIN_TABLE, inside the loop do the action you want, here two insert statement, one issue of this solution is you have same data in all address.
CREATE OR REPLACE FUNCTION get_all_MAIN_TABLE () RETURNS SETOF MAIN_TABLE AS
$BODY$
DECLARE
r MAIN_TABLE %rowtype;
BEGIN
FOR r IN
SELECT * FROM MAIN_TABLE
LOOP
-- can do some processing here
INSERT INTO ADDRESS_TABLE ( main_table_id, address_type, other_fielsds)
VALUES('shipping', r.main_table_id,'NAME','','other_fielsds');
INSERT INTO ADDRESS_TABLE ( main_table_id, address_type, other_fielsds)
VALUES('billing/default',r.main_table_id,'NAME','','other_fielsds');
END LOOP;
RETURN;
END
$BODY$
LANGUAGE plpgsql;
SELECT * FROM get_all_MAIN_TABLE ();
I'm new with SAS and I try to copy my Code from Access vba into SAS.
In Access I use often the SELECT INTO funtion, but it seems to me this function is not in SAS.
I have two tables and I get each day new data and I want to update my table with the new lines. Now I Need to check if some new lines appear -> if yes insert this lines into the old table.
I tried some Code from stackoverflow and other stuff from Google, but I didn't find something which works.
INSERT INTO OLD_TABLE T
VALUES (GRVID = VTGONR)
FROM NEW_TABLE V
WHERE not exists (SELECT V.VTGONR FROM NEW_TABLE V WHERE T.GRVID = V.VTGONR);
Not sure what the purpose of using the VALUES keyword is in your example. PROC SQL uses VALUES() to list static values. Like:
VALUES (100)
SAS just uses normal SQL syntax instead. See for example: https://www.techonthenet.com/sql/insert.php
To specify the observations to insert just use SELECT. You can add a WHERE clause as part of the select to limit the rows that you select to insert. To tell INSERT which columns to insert into list them inside () after the table name. Otherwise it will expect the order that the columns are listed in the select statement to match the order of the columns in the target table.
insert into old_table(GRVID)
select VTGONR from new_table
where VTGONR not in (select GRVID from old_table)
;
How to create a temporary table, if it does not already exist, and add the selected rows to it?
CREATE TABLE AS
is the simplest and fastest way:
CREATE TEMP TABLE tbl AS
SELECT * FROM tbl WHERE ... ;
Do not use SELECT INTO. See:
Combine two tables into a new one so that select rows from the other one are ignored
Not sure whether table already exists
CREATE TABLE IF NOT EXISTS ... was introduced in version Postgres 9.1.
For older versions, use the function provided in this related answer:
PostgreSQL create table if not exists
Then:
INSERT INTO tbl (col1, col2, ...)
SELECT col1, col2, ...
Chances are, something is going wrong in your code if the temp table already exists. Make sure you don't duplicate data in the table or something. Or consider the following paragraph ...
Unique names
Temporary tables are only visible within your current session (not to be confused with transaction!). So the table name cannot conflict with other sessions. If you need unique names within your session, you could use dynamic SQL and utilize a SEQUENCE:
Create once:
CREATE SEQUENCE tablename_helper_seq;
You could use a DO statement (or a plpgsql function):
DO
$do$
BEGIN
EXECUTE
'CREATE TEMP TABLE tbl' || nextval('tablename_helper_seq'::regclass) || ' AS
SELECT * FROM tbl WHERE ... ';
RAISE NOTICE 'Temporary table created: "tbl%"' || ', lastval();
END
$do$;
lastval() and currval(regclass) are instrumental to return the dynamically created table name.
I'm using Firebird as DB and I need to do this:
INSERT INTO TG (ID, UID, GID)
SELECT (INSERT INTO TBO VALUES (GEN_ID('o',1)) RETURNING ID), UID, 10
FROM TBL l
WHERE l.is=1
the part with select is OK when I use:
SELECT (GEN_ID('o',1)), UID, 10
FROM TBL l
WHERE l.is=1
but I need the ID in other table for dependency first.
I know about something called procedures but I have no idea how to use them. Is there an option to do this using SQL?
Take a look at EXECUTE BLOCK statement. It allow you to execute multiple statements in one "batch" or write complex logic if you cannot embed it in one SQL query.
Inside EXECUTE BLOCK you can write mutiple commands using PSQL.
EB allow input params, output params (yes you can use it as a table), local variables, if statement, while, for select etc... very powerfull tool.
Just prepare your block and execute it like simple SQL query.
A simpler aproach would be to use triggers.
In this example it would be a before insert trigger.
Something like this:
CREATE TRIGGER TG_BI0 FOR TABLE TG ACTIVE BEFORE INSERT 0
AS
BEGIN
/* Before insert create a new record in TBO */
INSERT INTO TBO (ID) VALUES (NEW.ID);
END
After having this trigger you shloud only insert records in TG.
INSERT INTO TG (ID, UID, GID)
VALUES (GEN_ID('o',1), 'SOME_UUID', 10)
After I got results from some query is there any name of temporary table created from those results???
No, but you can easily create a temporary table from the results of a select statement:
CREATE TEMPORARY TABLE temptablename AS
SELECT ...;
Then to get the result:
SELECT * FROM temptablename;