You cannot specify an iden.y column for a nonpar.ioned NoPI table, but you can specify an iden.y column for a column-par.ioned table. The GENERATED always generates a unique value for the column when Teradata Database inserts a new row into the table and NO CYCLE is specified..Teradata IDEN.Y columns. I have searched for an answer to my query and surprisingly have found no answer. I do find it a bit difficult to .Iden.y Column. You cannot specify iden.y columns for nonpar.ioned NoPI tables. You should not specify an iden.y column for a table that will be used with Unity Director. You cannot insert values into, or update, an iden.y column defined as GENERATED ALWAYS AS IDEN.Y..Always generates a unique value for the column when Teradata Database inserts a new row into the table and NO CYCLE is specified. If you load the same row twice into an iden.y column table, it is not rejected as a duplicate because it is made unique as soon as an iden.y column value is generated for it..
Re: Teradata IDEN.Y columns When records are stored with an iden.y column, the system gets a batch of numbers for each AMP .uming they go in by Insert Into/ Select . There are a number of reasons why they may not be consecutive, and there is no guarantee that the first input record is number 1, second number 2, etc..IDEN.Y column can be set on Teradata table. It can be done while creating a table and you can not alter once you created. You can not say that the numbers generated by . Teradata Unity does not support iden.y columns for bulk data loads because Teradata Database processes rows in different orders on different systems. Because of this, it is not possible to guarantee that the same data row isigned the same iden.y value on all systems.. What are Teradata Iden.y Columns? The iden.y column feature allows generating unique numbers for each row inserted into a column. Iden.y columns can be uses for transactional or bulk inserts. By using Iden.y Columns, we can reduce costs because column uniqueness is ensured without the overhead caused when using a unique constraint..
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IDEN.Y column can be set on Teradata table. It can be done while creating a table and you can not alter once you created. You can not say that the numbers generated by IDEN.Y .
In Teradata, the way I've been doing backups for tables is like this: create table_bak as with data. Works great, but I have just discovered that this doesn't work for tables with iden.y columns..
I am using DB2 v9 on LUW. I have a column defined like this: "ID" BIGINT NOT NULL GENERATED BY DEFAULT AS IDEN.Y START WITH 1, INCREMENT BY 1, CACHE 20, NO MINVALUE, NO MAXVALUE, NO .
DEFAULT AUTOINCREMENT and IDEN.Y are identical. IDEN.Y is supported for compatibility with Transact-SQL syntax of Sybase Adaptive Server Enterprise Sybase ASE and Microsoft SQL Server and implemented as DEFAULT AUTOINCREMENT: CREATE TABLE cities id INTEGER DEFAULT AUTOINCREMENT, name VARCHAR 90 ; -- is equivalent to CREATE TABLE cities id INTEGER IDEN.Y.