psql - 如何在不丢弃表的情况下刷新数据库内容

Question

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?

Answer 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;")

Answer 2

这个SQL查询应该删除表中的所有记录...

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