In cases where a schema name is offered (for instance, CREATE TABLE myschema.mytable .) then table is established within the specified schema. Otherwise its created in the present schema. Temporary tables exist in a special schema, therefore a schema title can not be offered when designing a short-term dining table. The name associated with dining table must certanly be distinct from the title of virtually any table, sequence, index, view, or international dining table in the schema that is same.
CREATE TABLEalso automatically creates a information type that represents the composite kind corresponding to 1 row of the dining table. Consequently, tables cannot have the same name as any existing data key in the schema that is same.
The constraint that is optional specify constraints (tests) that new or up-to-date rows must satisfy for the insert or up-date operation to succeed. A constraint can be an object that is SQL assists define the set of legitimate values within the dining table in various methods.
There are two main approaches to define constraints dining table constraints and line constraints. a column constraint is described as part of a column definition. a table constraint meaning is not linked with a column that is particular and it will encompass multiple line. Every column constraint can be written being a table constraint; a line constraint is only a convenience that is notational use as s n as the constraint just affects one column.
If specified, the dining table is established being a short-term dining table.