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ALTER SEQUENCE¶
Modifies the properties for an existing sequence.
- See also:
Syntax¶
ALTER SEQUENCE [ IF EXISTS ] <name> RENAME TO <new_name>
ALTER SEQUENCE [ IF EXISTS ] <name> [ SET ] [ INCREMENT [ BY ] [ = ] <sequence_interval> ]
ALTER SEQUENCE [ IF EXISTS ] <name> SET COMMENT = '<string_literal>'
ALTER SEQUENCE [ IF EXISTS ] <name> UNSET COMMENT
Parameters¶
nameSpecifies the identifier for the sequence to alter. If the identifier contains spaces or special characters, the entire string must be enclosed in double quotes. Identifiers enclosed in double quotes are also case-sensitive.
For more details about identifiers, see Identifier Requirements.
RENAME TO new_nameSpecifies the new identifier for the sequence; must be unique for the schema.
For more details about identifiers, see Identifier Requirements.
When an object is renamed, other objects that reference it must be updated with the new name.
SET...
[ INCREMENT [ BY ] sequence_interval ]Specifies the step interval of the sequence:
For positive sequence interval
n, the nextn-1values are reserved by each sequence call.For negative sequence interval
-n, the nextn-1lower values are reserved by each sequence call.Supported values are any non-zero value that can be represented by a 64-bit two’s complement integer.
COMMENT = 'string_literal'Adds a comment or overwrites an existing comment for the sequence.
UNSET ...Specifies the properties to unset for the sequence, which resets them to the defaults.
Currently, the only property you can unset is
COMMENT, which removes the comment, if one exists, for the sequence.
Usage Notes¶
The first/initial value for a sequence cannot be changed after the sequence is created.
Moving a sequence to a managed access schema (using the ALTER SEQUENCE … RENAME TO syntax) is prohibited unless the sequence owner (i.e. the role that has the OWNERSHIP privilege on the sequence) also owns the target schema.