![]() If no explicit name was specified, the system implicitly generates a unique name. ALTER TABLE tableName MODIFY COLUMN id INT / First you should drop auto increment / ALTER TABLE tableName DROP PRIMARY KEY / Dop primary key / ALTER TABLE. You can find the corresponding metadata for primary and foreign key constraints and NOT NULL constraints in the system tables EXA_ALL_CONSTRAINTS and EXA_ALL_CONSTRAINT_COLUMNS. The current setting of this parameter can be found in the system table EXA_PARAMETERS. ![]() If no explicit state is defined, then the session parameter CONSTRAINT_STATE_DEFAULT is used (see ALTER SESSION for more information). This state can be usefully if you want to define the metadata within the database, but avoid a negative performance impact. an Add Foreign Key option for adding foreign keys to Teradata database tables. This process costs some time but ensures the data integrity. The primary index is used to specify where the data resides in Teradata. The constraint is directly checked after DML statements (see Manipulation of the database (DML) for more information).
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