May 17, 2026, 11:40 PM

inbox/DataBase/PostgreSQL/object_management/manage.sequences.sql

@@ -0,0 +1,47 @@
+-- Find the sequence details:
+
+select * from pg_sequences;
+
+(or)
+
+\ds+
+
+List of relations
+Schema  | Name      | Type     | Owner        | Size | Description
+--------+-----------+----------+--------------+------------+-------------
+public  | class_seq | sequence | enterprisedb | 8192 bytes |
+(1 row)
+
+-- Create sequences:
+
+postgres# CREATE SEQUENCE class_seq INCREMENT 1 MINVALUE 1 MAXVALUE 1000 START 1;
+CREATE SEQUENCE
+
+-- Create sequence in descending:
+
+postgres# CREATE SEQUENCE class_seq INCREMENT -1 MINVALUE 1 MAXVALUE 1000 START 1000;
+CREATE SEQUENCE
+
+-- Alter sequence to change maxvalue:
+
+postgres=# alter sequence class_seq maxvalue 500;
+ALTER SEQUENCE
+
+-- Reset a sequence using alter command:
+
+postgres=# alter sequence class_seq restart with 1;
+ALTER SEQUENCE
+
+-- Find next_val and currval of a sequence:
+
+postgres=# select nextval('class_seq');
+nextval
+---------
+1
+(1 row)
+
+postgres=# select currval('class_seq');
+currval
+---------
+1
+(1 row)