PostgreSQL SELECT INTO和INSERT INTO SELECT 表複製語句

1、INSERT INTO FROM語句
    語句形式爲：INSERT INTO table2(field1,field2,…) SELECT value1,value2,… from table1 要求目標表table2必須存在。

    一、建立臨時表：

        create temporary table tmp_idfa_fm (id bigserial primary key,idfa text, num int);

    二、插入數據：

        insert into tmp_idfa_fm (idfa, num) select idfa, count(idfa) as ct from nlogs where idfa!='' and sendtime>='2015-09-01 00:00:00' and sendtime<'2015-12-01 00:00:00' group by idfa order by ct desc ;

 

2、SELECT INTO FROM語句

    語句形式爲：SELECT vale1, value2 into table2 FROM table1

    要求目標表table2不存在，由於在插入時會自動建立表table2，並將table1中指定字段數據複製到table2中。

    查詢語句：

        select idfa, recvtime into tmp_tb1 from nlogs where recvtime>='2015-09-01 00:00:00' and recvtime<'2015-09-03 00:00:00';