Oracle PL/SQL/System Tables Views/USER TAB COLUMNS

Query the USER_TAB_COLUMNS view to get all columns for a table that you own

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SQL> -- create demo table SQL> create table TestTable(

 2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
 3    MyName             VARCHAR2(10 BYTE),
 4    MyDate             DATE,
 5    MyNumber           Number(8,2)
 6  )
 7  /

Table created. SQL> SQL> SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19960711","YYYYMMDD"),12.12); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19970622","YYYYMMDD"),-12.12); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19980513","YYYYMMDD"),22.1); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("19990624","YYYYMMDD"),-2.12); 1 row created. SQL> insert into TestTable (ID, MyName, MyDate, MyNumber) values("1","Alison",to_date("20000415","YYYYMMDD"),2.1); 1 row created. SQL> SQL> SQL> select * from TestTable; ID MYNAME MYDATE MYNUMBER

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1 Alison 11-JUL-96 12.12 1 Alison 22-JUN-97 -12.12 1 Alison 13-MAY-98 22.1 1 Alison 24-JUN-99 -2.12 1 Alison 15-APR-00 2.1 SQL> SQL> -- Query the USER_TAB_COLUMNS view to get all columns for a table that you own, SQL> SQL> commit; Commit complete. SQL> SQL> SQL> SELECT table_name, column_name, data_type, data_length

 2  FROM USER_TAB_COLUMNS
 3  WHERE table_name = "TESTTABLE"
 4  ORDER BY column_id;

TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH

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TESTTABLE ID VARCHAR2 4 TESTTABLE MYNAME VARCHAR2 10 TESTTABLE MYDATE DATE 7 TESTTABLE MYNUMBER NUMBER 22 SQL> SQL> SQL> drop table TestTable; Table dropped. SQL> SQL> commit; Commit complete. SQL> SQL>

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