A、UNIQUE
B、NOT NULL
C、CHECK
D、PRIMARY KEY
E、FOREIGN KEY
更多“Which constraint can be defined only at the column level?（）”相关的问题
A、Constraint names must start with SYS_C B、All constraints must be defines at the column level C、Constraints can be created after the table is created D、Constraints can be created at the same time the table is created E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view
A、Constraint names must start with SYS_C B、All constraints must be defines at the column level C、Constraints can be created after the table is created D、Constraints can be created at the same time the table is created E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view
A、A. Constraint names must start with SYS_C B、B. All constraints must be defines at the column level. C、C. Constraints can be created after the table is created. D、D. Constraints can be created at the same time the table is created. E、E. Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.
A、ALTER TABLE table_name ENABLE constraint_name; B、ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name; C、ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name; D、ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name;
A、ALTER TABLE table_name ENABLE constraint_name; B、ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name; C、ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name; D、ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name;
A、A. ALTER TABLE table_name ENABLE constraint_name; B、B. ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint_name; C、C. ALTER TABLE table_name ENABLE CONSTRAINT constraint_name; D、D. ALTER TABLE table_name STATUS ENABLE CONSTRAINT constraint_name; E、E. ALTER TABLE table_name TURN ON CONSTRAINT constraint_name;
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