Values ...................................................................................... 60 5.3. Identity Columns ................................................................................... 61 5 ....................................................................................... 60 5.3. Identity Columns ....................................................................................... 1.4. 5.3. Identity Columns An identity column is a special column that is generated automatically from an implicit sequence. It can be used to generate key values. To create an identity column, use

....................................................................................... 65 5.3. Identity Columns ....................................................................................... ....................................................................................... 65 5.3. Identity Columns ....................................................................................... 1.4. 5.3. Identity Columns An identity column is a special column that is generated automatically from an implicit sequence. It can be used to generate key values. To create an identity column, use

The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual ) cmin The command identifier (starting at zero) within the inserting transaction. xmax The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible PostgreSQL-specific way to create an autoincrementing column. An- other way is to use the SQL-standard identity column feature, described at CREATE TABLE. The data types smallserial, serial and bigserial are

joined against the oid column of pg_class to obtain the table name. xmin 67 Data Definition The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual ) cmin The command identifier (starting at zero) within the inserting transaction. xmax The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible PostgreSQL-specific way to create an autoincrementing column. Another way is to use the SQL-standard identity column feature, described at CREATE TABLE. The data types smallserial, serial and bigserial are

except tableoid. 60 Data Definition • A generated column cannot have a column default or an identity definition. • A generated column cannot be part of a partition key. • Foreign tables can have The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual identifier (starting at zero) within the inserting transaction. xmax 69 Data Definition The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible

except tableoid. 61 Data Definition • A generated column cannot have a column default or an identity definition. • A generated column cannot be part of a partition key. • Foreign tables can have The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual identifier (starting at zero) within the inserting transaction. xmax 70 Data Definition The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible

reference a system column, except tableoid. • A generated column cannot have a column default or an identity definition. • A generated column cannot be part of a partition key. • Foreign tables can have The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual ) cmin The command identifier (starting at zero) within the inserting transaction. xmax The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible

except tableoid. 60 Data Definition • A generated column cannot have a column default or an identity definition. • A generated column cannot be part of a partition key. • Foreign tables can have The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual identifier (starting at zero) within the inserting transaction. xmax 69 Data Definition The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible

reference a system column, except tableoid. • A generated column cannot have a column default or an identity definition. • A generated column cannot be part of a partition key. • Foreign tables can have The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual ) cmin The command identifier (starting at zero) within the inserting transaction. xmax The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible

The tableoid can be joined against the oid column of pg_class to obtain the table name. xmin The identity (transaction ID) of the inserting transaction for this row version. (A row version is an individual identifier (starting at zero) within the inserting transaction. xmax 69 Data Definition The identity (transaction ID) of the deleting transaction, or zero for an undeleted row version. It is possible PostgreSQL-specific way to create an autoincrementing column. An- other way is to use the SQL-standard identity column feature, described at CREATE TABLE. The data types smallserial, serial and bigserial are