sql根据已有的表建新表：create table tab_new as select col1,col2… from

sql根据已有的表建新表：create table tab_new as select col1,col2… from SQL> CREATE TABLE Y AS SELECT * FROM X WHERE no=2 create table party_centification_bak as select * from party_ SQL 语句 "SELECT * FROM {{table}} WHERE `fleet_end_time` ms sql :select * from (select *from b) as xxx where 和 select SQL语句理解 select * from B where (select count(1) as num from A $sql="SELECT count(*) as pcount FROM news" 和$sql = "UPDATE a sql.append(" SELECT * FROM test_user sql="select P.*,T.name as Typename from tb_function P inner select min(name) from table sql语句的用法：select as sql 语句中 select * from table where 2=1 的where2=1有什么意思和作用