General: LongSequenceKey
Produces a field that is the record number in a table, stored as a continuous long integer
Purpose
Use this function to:
- Create a unique primary key on an existing table where the number of records may exceed 2 billion
- Identify and select specific records by number
Return Value
| Property | Value |
|---|---|
| FieldType | LongInteger |
| FieldSize | Continuous |
| DataType | Continuous |
| DataSize | LongInteger |
Example Return Value: 1.....N where N = number of records in the table.FieldSize and DataSize will depend on the number of records in the table:
- LongSequenceKey will be a Continuous DataSize and FieldSize. See FieldType and DataTypes for more information.
- LongSequenceKey is valid for a stupidly large number of records (+- 263 -1). For tables larger than this, find a quantum computer…
Parameters
| Parameter | JSON | Description |
|---|---|---|
| Table | “targetTable”: “MyTableName” | The target table on which the new field will be created |
| Filter | “dataset”: {DataSet_JSON} | NOT USED |
| Function | "function":"longsequencekey" | LongSequenceKey |
JSON Sample
{
"method": "BuildBakedField",
"project": "D3",
"targetTable": "transactions",
"overwrite": true,
"name": "LongKey",
"function": "longsequencekey"
}
Usage Notes
LongSequenceKey does not support filters.
See Also:
- Engineering | Expression Field
- IntegerSequenceKey (General Functions)
- MakeContinuousKey (General Functions)
Example
| Example | Details |
|---|---|
| Description | Create Unique Key of record number |
| Input |
|
| Sample |  |