MariaDB starting with 10.3.1
----------------------------
SEQUENCEs were introduced in MariaDB 10.3.

Syntax
------

SETVAL(sequence_name, next_value, [is_used, [round]])

Description
-----------

Set the next value to be returned for a SEQUENCE.

This function is compatible with PostgreSQL syntax, extended with the round
argument.

If the is_used argument is not given or is 1 or true, then the next used value
will one after the given value. If is_used is 0 or false then the next
generated value will be the given value.

If round is used then it will set the round value (or the internal cycle
count, starting at zero) for the sequence. If round is not used, it's assumed
to be 0.

next_value must be an integer literal.

For SEQUENCE tables defined with CYCLE (see CREATE SEQUENCE) one should use
both next_value and round to define the next value. In this case the current
sequence value is defined to be round, next_value.

The result returned by SETVAL() is next_value or NULL if the given next_value
and round is smaller than the current value.

SETVAL() will not set the SEQUENCE value to a something that is less than its
current value. This is needed to ensure that SETVAL() is replication safe. If
you want to set the SEQUENCE to a smaller number use ALTER SEQUENCE.

If CYCLE is used, first round and then next_value are compared to see if the
value is bigger than the current value.

Internally, in the MariaDB server, SETVAL() is used to inform slaves that a
SEQUENCE has changed value. The slave may get SETVAL() statements out of
order, but this is ok as only the biggest one will have an effect.

SETVAL requires the INSERT privilege.

Examples
--------

SELECT setval(foo, 42);           -- Next nextval will return 43
SELECT setval(foo, 42, true);     -- Same as above
SELECT setval(foo, 42, false);    -- Next nextval will return 42

SETVAL setting higher and lower values on a sequence with an increment of 10:

SELECT NEXTVAL(s);
+------------+
| NEXTVAL(s) |
+------------+
|         50 |
+------------+

SELECT SETVAL(s, 100);
+----------------+
| SETVAL(s, 100) |
+----------------+
|            100 |
+----------------+

SELECT NEXTVAL(s);
+------------+
| NEXTVAL(s) |
+------------+
|        110 |
+------------+

SELECT SETVAL(s, 50);
+---------------+
| SETVAL(s, 50) |
+---------------+
|          NULL |
+---------------+

SELECT NEXTVAL(s);
+------------+
| NEXTVAL(s) |
+------------+
|        120 |
+------------+

Example demonstrating round:

CREATE OR REPLACE SEQUENCE s1
 START WITH 1
 MINVALUE 1
 MAXVALUE 99
 INCREMENT BY 1
 CACHE 20
 CYCLE;

SELECT SETVAL(s1, 99, 1, 0);
+----------------------+
| SETVAL(s1, 99, 1, 0) |
+----------------------+
|                   99 |
+----------------------+

SELECT NEXTVAL(s1);
+-------------+
| NEXTVAL(s1) |
+-------------+
|           1 |
+-------------+

The following statement returns NULL, as the given next_value and round is
smaller than the current value.

SELECT SETVAL(s1, 99, 1, 0);
+----------------------+
| SETVAL(s1, 99, 1, 0) |
+----------------------+
|                 NULL |
+----------------------+

SELECT NEXTVAL(s1);
+-------------+
| NEXTVAL(s1) |
+-------------+
|           2 |
+-------------+

Increasing the round from zero to 1 will allow next_value to be returned.

SELECT SETVAL(s1, 99, 1, 1);
+----------------------+
| SETVAL(s1, 99, 1, 1) |
+----------------------+
|                   99 |
+----------------------+

SELECT NEXTVAL(s1);
+-------------+
| NEXTVAL(s1) |
+-------------+
|           1 |
+-------------+

URL: https://mariadb.com/kb/en/setval/