crosideal.blogg.se - Postgresql select into temp table

#POSTGRESQL SELECT INTO TEMP TABLE HOW TO#
#POSTGRESQL SELECT INTO TEMP TABLE CODE#

Only the first session can access it.Īfter that, quit all the sessions: test=# \q Code language: PostgreSQL SQL dialect and PL/pgSQL ( pgsql )įinally, log in to the database server again and query data from the mytemp table: test=# SELECT * FROM mytemp Then, launch another session that connects to the test database and query data from the mytemp table: test=# SELECT * FROM mytemp Īs can see clearly from the output, the second session could not see the mytemp table. Next, create a temporary table named mytemp as follows: test=# CREATE TEMP TABLE mytemp(c INT) Code language: PostgreSQL SQL dialect and PL/pgSQL ( pgsql ) You are now connected to database "test" as user "postgres". In other words, it is invisible to other sessions.įirst, log in to the PostgreSQL database server using the psql program and create a new database named test: postgres=# CREATE DATABASE test The TEMP and TEMPORARY keywords are equivalent so you can use them interchangeably: CREATE TEMP TABLE temp_table(Ĭode language: PostgreSQL SQL dialect and PL/pgSQL ( pgsql )Ī temporary table is visible only to the session that creates it.

Second, specify the column list, which is the same as the one in the CREATE TABLE statement.

First, specify the name of the temporary table after the CREATE TEMPORARY TABLE keywords.

) Code language: PostgreSQL SQL dialect and PL/pgSQL ( pgsql ) To create a temporary table, you use the CREATE TEMPORARY TABLE statement: CREATE TEMPORARY TABLE temp_table_name( PostgreSQL automatically drops the temporary tables at the end of a session or a transaction. Creating a PostgreSQL temporary tableĪ temporary table, as its name implied, is a short-lived table that exists for the duration of a database session.

#POSTGRESQL SELECT INTO TEMP TABLE HOW TO#

Summary: in this tutorial, you will learn about the PostgreSQL temporary table and how to manage it effectively. "Privileges" are typically something that multiple users can share. Then privileges are deleted automatically when you delete rows in "T_USER_PRIVILEGES", due to the CASCADE clause. REFERENCES "T_USER_PRIVILEGES"("PRIVILEGE_ID") If so, drop this constraint and create one on "T_PRIVILEGE"."ID" instead: ALTER TABLE "T_PRIVILEGE"ĪDD CONSTRAINT "FK_T_PRIVILEGE_ID" FOREIGN KEY ("ID") Leaving aside my doubts towards your database design and your naming convention.Īccording to your comment, your FK constraint "FK_T_USER_PRIVILEGES_PRIVILEGES" seems to be pointing in the wrong direction: it's for the case where multiple users can be linked to the same privilege (which would make sense). WHERE "USER_ID" = _userid - provide userid here Just use a data-modifying CTE: WITH del1 AS ( You could implement what you are trying with a plpgsql function (applying some of the advice already provided in the comments): CREATE OR REPLACE FUNCTION "SP_DELETE_USER"(_userid varchar) RETURNS void ASĬREATE TEMP TABLE temp_privilege_ids ON COMMIT DROP ASīut that's still needlessly convoluted. You could create the temp table by hand to pass the superficial syntax check at creation time and allow the creation of the function, but the function would still fail at execution. Language SQL functions are planned at once, so you cannot reference any tables that are not there yet. ON "T_USER_PRIVILEGES" ("PRIVILEGE_ID" COLLATE pg_catalog."default") REFERENCES "T_PRIVILEGE" ("ID") MATCH SIMPLEĬONSTRAINT "FK_T_USER_PRIVILEGES_USER" FOREIGN KEY ("USER_ID")ĬREATE INDEX "FKI_T_USER_PRIVILEGES_PRIVILEGES"

"PRIVILEGE_ID" character varying(100) NOT NULL,ĬONSTRAINT "PK_T_USER_PRIVILEGES" PRIMARY KEY ("USER_ID", "PRIVILEGE_ID"),ĬONSTRAINT "FK_T_USER_PRIVILEGES_PRIVILEGES" FOREIGN KEY ("PRIVILEGE_ID") "USER_ID" character varying(100) NOT NULL, This is the reference table: CREATE TABLE "T_USER_PRIVILEGES" (

I have searched everywhere for an explanation, but didn't find an answer. LINE 19: (SELECT privilege_id FROM temp_privilege_ids) $BODY$ When I try to create the SP pgAdmin says: relation "temp_privilege_ids" does not exist (SELECT privilege_id FROM temp_privilege_ids) $BODY$ĪLTER FUNCTION public."SP_DELETE_USER"(character varying) $BODY$CREATE TEMP TABLE temp_privilege_ids What I try to do is create a stored procedure that accomplishes it: CREATE FUNCTION "SP_DELETE_USER"(userid character varying) RETURNS void AS I want to create a temp table holding all the referenced rows from T_PRIVILEGE, then delete all the references from T_USER_PRIVILEGES, and finally delete all the rows from T_PRIVILEGE that are stored in the temp table. I want to delete a row from T_USER, for which i need to delete the references from T_USER_PRIVILEGES first, and also all referenced rows from T_PRIVILEGE. T_USER_PRIVILEGES is a reference table holding references from T_USER rows to T_PRIVILEGE rows. I have 3 tables - T_USER, T_PRIVILEGE and T_USER_PRIVILEGES.