This action returns the next free number in a sequence (e.g. to generate
a new unique identifier of a record in a database table).
A sequence is a series of whole numbers, starting from 1. When the action
is first used for a specific sequence, it returns 1. The next time it is used
for the same sequence, it returns 2, etc.
To identify the sequence, set the Key property of the action to the name
of the sequence (e.g. if you want to generate a unique identifier for records
in a certain database table, you can set the Key property to the name
of the table). Alternatively, use the <Key> trigger.
By default, all sequence numbers are kept is a special database table
(Sequence_Numbers). To use a different table, set the
sequenceNumberTable property of the action to the name of the
database table to use (or use the <Table Name> trigger).
The action's template has one exit (<Next>),
returning the generated sequence number.
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