陈小果的轨迹

T1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 ON boolean_expressionT1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 USING ( join column list )T1 NATURAL { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2INNER 和 OUTER 对所有连接（join） 类型都

<br />一、查看数据库的SQL<br />1、查看表空间的名称及大小<br /><br />    select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size<br />    from dba_tablespaces t, dba_data_files d<br />    where t.tablespace_name = d.tablespace_name<br />    group by t.tablespace_name

<br />1, PL/SQL and SQL difference :<br />    <br />    SQL gives us complete access to our data , By complete, I mean we can get to everything...eventually.. in less than <br />ideal ways in many cases. There is no guarantee of efficiency and few actual p