Oracle免费版和付费版
https://www.cnblogs.com/yingsong/p/4437704.html
查看权限表
select * from system_privilege_map;
查看 前两行的数据
SELECT * FROM ZSLTEST.EMP WHERE ROWNUM <= 2
expdp system/admin directory=dbdata dumpfile=gc_db2.dmp logfile=gc_db2.log schemas=gc_db
impdp sytem/admin directory=dbdata dumpfile=gc_db2.dmp logfile=gc_db2.log schemas=gc_db
创建表
CREATE TABLE Persons
(
Id_P int,
LastName varchar(255),
FirstName varchar(255),
Address varchar(255),
City varchar(255)
)
CREATE TABLE "GC_DB"."PERSONS2"
( "ID_P" NUMBER(*,0),
"LASTNAME" VARCHAR2(255),
"FIRSTNAME" VARCHAR2(255),
"ADDRESS" VARCHAR2(255),
"CITY" VARCHAR2(255)
)
INSERT INTO Persons VALUES (\'1\',\'Gates\', \'Bill\', \'Xuanwumen 10\', \'Beijing\')
SELECT * FROM persons WHERE Id_P=1
UPDATE Persons SET Address=\'Zhongshan 23\', City=\'Nanjing\' WHERE Id_P=1
DELETE FROM Persons WHERE City=\'Beijing\'
SQL>delete from Persons; //删除表的数据
SQL>drop table Persons; //删除表的结构和数据
SQL>delete from Persons where WHERE Id_P=1 //删除一条记录
SQL>truncate table student; //删除表中的所有记录，表结构还在，不写日志，无法扎找回的记录，速度快