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Oracle ???????

1. ?????

??SQL Plus??Oracle?????????????

sqlplus /nolog

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conn username/password@localhost:port

???username ???????password ????localhost:port ????listen???

2. ????

• ??????????

CREATE USER username IDENTIFIED BY password;

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GRANT CONNECT TO username;GRANT RESOURCE TO username;

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CREATE USER username DEFAULT TABLESPACE tablespace_name;

3. SQL ??

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SELECT status FROM v$database;

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shutdown immediate;startup;

4. ????

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CREATE TABLE table_name (column_name column_type);ALTER TABLE table_name MOVE ONLINE TO new_tablespace;

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CREATE TABLE new_table AS SELECT * FROM old_table;

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TRUNCATE TABLE table_name;

5. ????

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ALTER TABLE table_name ADD CONSTRAINT pk_column PRIMARY KEY (column_name);

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ALTER TABLE table_name ADD CONSTRAINT ck_column CHECK (condition);

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ALTER TABLE table_name ADD CONSTRAINT un_unique_column UNIQUE (column_name);

6. ????

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SELECT TO_CHAR(sysdate, 'YYYY-MM-DD HH24:MI:SS') FROM DUAL;

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ROUND(number, decimal_places);

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TRUNC(number, decimal_places);

7. ????

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CREATE SEQUENCE sequence_name START WITH 1 INCREMENT BY 1 MINVALUE 1 NOMAXVALUE;

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ALTER SEQUENCE sequence_name MAXVALUE 10000;

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DROP SEQUENCE sequence_name;

8. ?????

• ???????????????

CREATE TABLESPACE tablespace_name DATAFILE '/u01/orcl/datafile.dbf' SIZE 100M;

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ALTER TABLESPACE tablespace_name ADD DATAFILE '/u02/orcl/datafile2.dbf' SIZE 200M;

9. ?????

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RECOVER DATABASE; RECOVER DATABASE TO time_stamp;

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DELETE OLD SNAPSHOT LOG;

10. ????

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SELECT * FROM dual;

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SELECT column FROM table WHERE condition;

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SELECT * FROM table LIMIT 10 OFFSET 5;

????????????????Oracle?????????????????????????

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