create table sk as select 1 x from dual; 我想知道这里面的 1

create table party_centification_bak as select * from party_ SQL> CREATE TABLE Y AS SELECT * FROM X WHERE no=2 insert into REC_OVER(ORG_ID) select '1' from dual where not sql根据已有的表建新表：create table tab_new as select col1,col2… from SELECT sum(1) FROM table;和SELECT count(1) FROM table; SQL语句理解 select * from B where (select count(1) as num from A sql 语句中 select * from table where 2=1 的where2=1有什么意思和作用 select min(name) from table select count(1) from emp SQL 语句 "SELECT * FROM {{table}} WHERE `fleet_end_time` 解释数SQL面的 select * from a, b 是什么意思 select*from ‘ * ’ 的意义?