摘要：
子查询(Subquery)是指出现在其他SQL语句内的SELECT子句例如：SELECT * FROM t1 WHERE col1 = (SELECT col2 FROM t2);其中SELECT * FROM t1，称为Outer Query/Outer Statement（外层查询）SELECT... 阅读全文
摘要：
插入记录INSERT [INTO] tbl_name [(col_name,...)] {VALUES丨VALUE} ({expr丨DEFAULT},...) (...),...INSERT [INTO] tbl_name SET col_name = {expr丨DEFAULT},...说明：此方... 阅读全文