Oracle PL/SQL Tutorial/System Tables Data Dictionary/user tables
Содержание
30. Create disable trigger command by querying user_triggers table
<source lang="sql">
SQL> SQL> SELECT "ALTER TABLE " || table_name || " DISABLE ALL TRIGGERS;"
2 FROM user_tables a 3 WHERE EXISTS 4 (SELECT "X" 5 FROM user_triggers 6 WHERE table_name = a.table_name) 7 and rownum < 2 8 ORDER BY table_name;
"ALTERTABLE"||TABLE_NAME||"DISABLEALLTRIGGERS;"
ALTER TABLE STUDENT DISABLE ALL TRIGGERS; SQL> SQL></source>
30. Find out the names of the tables you own
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SQL> SQL> --USER_TABLES is a view in the Oracle data dictionary. SQL> SQL> SQL> select table_name from user_tables
2 /
TABLE_NAME
EMPLOYEE_TAB EMP_DEPT PEOPLE SESSION_TAB SESS_EVENT TEMP_ALL_OBJECTS TRANSACTION_TAB 7 rows selected. SQL></source>
30. Getting a list of your own tables
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SQL> SQL> SQL> SELECT table_name FROM user_tables where rownum < 50; TABLE_NAME
HAZARD_LEVEL_T PUBLICATION DDL_AUDIT SITE_TAB HOME_ADDRESS_LIST HOME_ADDRESES_TAB I1 T1_TIMES I2 MAP AVAIL_TRACE_FILES PARTS LOG_TABLE DUMMY WORKING_CUSTOMERS OUTRAIN INTEREST TEST_BFILE P 19 rows selected. SQL> SQL> SQL></source>
30. Getting Information on Tables
<source lang="sql">
SQL> SQL> desc user_tables;
Name Null? Type TABLE_NAME NOT NULL VARCHAR2(30) TABLESPACE_NAME VARCHAR2(30) CLUSTER_NAME VARCHAR2(30) IOT_NAME VARCHAR2(30) STATUS VARCHAR2(8) PCT_FREE NUMBER PCT_USED NUMBER INI_TRANS NUMBER MAX_TRANS NUMBER INITIAL_EXTENT NUMBER NEXT_EXTENT NUMBER MIN_EXTENTS NUMBER MAX_EXTENTS NUMBER PCT_INCREASE NUMBER FREELISTS NUMBER FREELIST_GROUPS NUMBER LOGGING VARCHAR2(3) BACKED_UP VARCHAR2(1) NUM_ROWS NUMBER BLOCKS NUMBER EMPTY_BLOCKS NUMBER AVG_SPACE NUMBER CHAIN_CNT NUMBER AVG_ROW_LEN NUMBER AVG_SPACE_FREELIST_BLOCKS NUMBER NUM_FREELIST_BLOCKS NUMBER DEGREE VARCHAR2(10) INSTANCES VARCHAR2(10) CACHE VARCHAR2(5) TABLE_LOCK VARCHAR2(8) SAMPLE_SIZE NUMBER LAST_ANALYZED DATE PARTITIONED VARCHAR2(3) IOT_TYPE VARCHAR2(12) TEMPORARY VARCHAR2(1) SECONDARY VARCHAR2(1) NESTED VARCHAR2(3) BUFFER_POOL VARCHAR2(7) ROW_MOVEMENT VARCHAR2(8) GLOBAL_STATS VARCHAR2(3) USER_STATS VARCHAR2(3) DURATION VARCHAR2(15) SKIP_CORRUPT VARCHAR2(8) MONITORING VARCHAR2(3) CLUSTER_OWNER VARCHAR2(30) DEPENDENCIES VARCHAR2(8) COMPRESSION VARCHAR2(8) DROPPED VARCHAR2(3)
SQL> SQL> -- create demo table SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 /
Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SELECT table_name, tablespace_name, temporary
2 FROM user_tables
3 WHERE table_name IN ("EMPLOYEE");
TABLE_NAME TABLESPACE_NAME T
------------------------------ -
EMPLOYEE SYSTEM N SQL> SQL> SQL> -- clean the table SQL> drop table Employee
2 /
Table dropped. SQL> SQL></source>
30. Query user_tables for a table name
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SQL> SQL> SQL> select table_name from user_tables where table_name like "%REGION1"; no rows selected SQL></source>
