psql - how to flush database content without dropp

问题:

I have a table in my db called 'mytable'. I'd like to clear it so that I can continue to collect and analyze 'fresh data' from it.

Something like

conn = psycopg2.connect(database = mydb_name, host = mydb_server, user = mydb_uname, password = mydb_pwd)
cur = conn.cursor()
cur.execute("DROP TABLE mytable;")

Isn't going to work for me, because as far as I understand it, this destroys the table. I don't want to destroy/re-create... Just to flush all data.

How can I work this out?

回答1:

 Truncate tablename

Is useful for this, table stays just dropping the data!

If you have foreign keys you need to use the following

 Truncate tablename CASCADE

For many tables do like this

 Truncate table1, table2, table3

Your example

 Cur.execute("truncate mytable;")

回答2:

This sql query should delete all records from a table...

DELETE FROM mytable; // not DELETE * FROM mytable;