Oracle PL/SQL Tutorial/System Tables Data Dictionary/user sequences — различия между версиями

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Текущая версия на 10:08, 26 мая 2010

Get Sequence information from user_sequences table

SQL> CREATE SEQUENCE test_seq
  2  START WITH 10 INCREMENT BY 5
  3  MINVALUE 10 MAXVALUE 20
  4  CYCLE CACHE 2 ORDER;
Sequence created.
SQL>
SQL> select * from user_sequences where sequence_name="TEST_SEQ";
SEQUENCE_NAME                   MIN_VALUE  MAX_VALUE INCREMENT_BY C O CACHE_SIZE LAST_NUMBER
------------------------------ ---------- ---------- ------------ - - ---------- -----------
TEST_SEQ                               10         20            5 Y Y          2          10
SQL>
SQL>
SQL> drop sequence test_seq


Getting Information on Sequences

You get information on your sequences from user_sequences.



SQL> desc user_sequences;
 Name              Null?    Type
 ------------------
 SEQUENCE_NAME     NOT NULL VARCHAR2(30)
 MIN_VALUE                  NUMBER
 MAX_VALUE                  NUMBER
 INCREMENT_BY      NOT NULL NUMBER
 CYCLE_FLAG                 VARCHAR2(1)
 ORDER_FLAG                 VARCHAR2(1)
 CACHE_SIZE        NOT NULL NUMBER
 LAST_NUMBER       NOT NULL NUMBER