oracle数据库操纵语言DML

oracle数据库操纵语言：DML
添加数据：
()直接添加数据：
    insert into table_name(column_name1,column_name2,...) values(data1,data2...);
()通过其他数据表添加(目标表已存在)：
    insert into table_name(column_name1,column_name2,...) select column_name1,column_name2... from table_name2;
()添加数据同时创建表(目标表待创建)：
    create table table_name as select column_name1,column_name2,...from source_table;

修改数据：
    update table_name set column_name1=data1,column_name2=data2,... [where condition];

删除表中数据：
()条件删除：
    delete from table_name [where condition];
()全部删除：
    truncate table table_name;

同时修改和添加：
    merge [into] table_name1
    using table_name2
    on (condition)
    when matched then merge_update_clause
    when not matched then merge_insert_clause;
()省略增加的语句
    merge into login
    using managerinfo
    on (login.login_id = managerinfo.managerid)
    when matched then update
    set login.loginname = managerinfo.loginname;
()省略修改的语句
    merge into login
    on(login.login_id=managerinfo.managerid)
    when not matched then insert
    values(managerinfo.loginname,managerinfo.password,managerinfo.managerid);
()增加和修改同时进行
    merge into login
    using managerinfo
    on(login.login_id = managerinfo.managerid)
    when matched then update
    set login.loginname = managerinfo.loginname
    when not matched then insert
    values(managerinfo.loginname,managerinfo.password,managerinfo.managerid);