![]() ![]() PostgreSQL inserts statement covers some rules for the successful execution of a query. columns to synchronize their work and two could both start a long running process on the same subject if the select and insert are separate queries. The basic syntax is as follows INSERT INTO tablename (column1, column2 ) SELECT column1, column2 FROM table1, table2 WHERE VALUE OPERATOR Example Consider a table COMPANYBKP, with similar structure as COMPANY table and can be created using the same CREATE TABLE using COMPANYBKP as the table name. Step 1: Select a Table Using dt Command Firstly, select a table where you want to insert the data. Insert statement is used for the addition of new data in rows of tables. This should be a single query because there are several worker processes that are using the status1, status2. The current query tries to insert a NULL subject_id in this case. Handle the case where there are no more users available.The current ON CONFLICT clause handles this. Claim a subject_id that has an entry in status for another status column.Claim a subject_id that has no entry in status. ![]() In that case I don't want anything to happen, but I would also prefer not to get errors in my log when that happens. The ON CONFLICT clause correctly handles the case where the subject_id already exists in status, but no the case where my subquery returns 0 results. ON CONFLICT (subject_id) DO update SET status1 = 'processing' WHERE (status.status1 IS NULL or status.status1 = 'ready')Īnd usrs.start_date IS NOT NULL LIMIT 1)) LEFT OUTER JOIN status ON (u.subject_id = status.subject_id) In this case, the tmpperson table has the same columns as person. The guide has some other good tips on how to speed up the process, like removing indexes and foreign keys before loading the data (and adding them back afterwards). You can insert data in a table as the result of a select statement: INSERT INTO person SELECT FROM tmpperson WHERE age < 30 Note that the projection of the select must match the columns required for the insert. (status1, subject_id) VALUES ('processing', 12 Answers Sorted by: 292 PostgreSQL has a guide on how to best populate a database initially, and they suggest using the COPY command for bulk loading rows. ON DELETE CASCADE, status1 varchar, status2 varchar)ĬREATE TABLE users(subject_id UUID PRIMARY KEY, start_date BIGINT) I have a status table that I am using to sync other long running processes, and my following query/system is functioning, but also filling up my error logs: CREATE TABLE status(subject_id UUID PRIMARY KEY REFERENCES users(subject_id) ![]()
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