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Which two statements about creating constraints are true?()
- 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
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更多 “Which two statements about creating constraints are true?()A、Constraint names must start with SYS_CB、All constraints must be defines at the column levelC、Constraints can be created after the table is createdD、Constraints can be created at the same time the table is createdE、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view” 相关考题
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What is true about updates through a view? ()
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When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?()A、The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.B、The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.C、The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.D、The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
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Examine the command that is used to create a table: SQL CREATE TABLE orders(oid NUMBER(6) PRIMARY KEY, odate DATE, ccode NUMBER(6), oamt NUMBER(10,2)) TABLESPACE users; Which two statements are true about the effect of the above command) ()A、A CHECK constraint is created on the OID column.B、A NOT NULL constraint is created on the OID column.C、The ORDERS table is the only object created in the USERS tablespace.D、The ORDERS table and a unique index are created in the USERS tablespace.E、The ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.
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Which two statements about creating constraints are true? ()A、Constraint names must start with SYS_CB、All constraints must be defines at the column levelC、Constraints can be created after the table is createdD、Constraints can be created at the same time the table is createdE、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view
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Which two statements about creating constraints are true?()A、Constraint names must start with SYS_CB、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.
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多选题You execute this command to drop the ITEM table, which has the primary key referred in the ORDERtable: SQL DROP TABLE scott.item CASCADE CONSTRAINTS PURGE; Which two statements are true about the effect of the command()ANo flashback is possible to bring back the ITEM table.BThe ORDER table is dropped along with the ITEM table.CThe dependent referential integrity constraints in the ORDER table are disabled.DThe dependent referential integrity constraints in the ORDER table are removed.EThe table definition of the ITEM table and associated indexes are placed in the recycle bin.
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多选题Which two statements are true about constraints? ()AThe UNIQUE constraint does not permit a null value for the column.BA UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.CThe PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.DThe NOT NULL constraint ensures that null values are not permitted for the column.
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多选题Which two statements about views are true?()AA view can be created as read only.BA view can be created as a join on two or more tables.CA view cannot have an ORDER BY clause in the SELECT statement.DA view cannot be created with a GROUP BY clause in the SELECT statement.EA view must have aliases defined for the column names in the SELECT statement.
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多选题Which two statements about creating constraints are true?()AConstraint names must start with SYS_CBAll constraints must be defines at the column levelCConstraints can be created after the table is createdDConstraints can be created at the same time the table is createdEInformation about constraints is found in the VIEW_CONSTRAINTS dictionary view
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单选题What is true about sequences? ()A
Once created, a sequence belongs to a specific schema.B
Once created, a sequence is linked to a specific table.C
Once created, a sequence is automatically available to all users.D
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Once created, a sequence is automatically used in all INSERT and UPDATE statements.
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多选题Which two statements about creating constraints are true?()AConstraint names must start with SYS_CBAll constraints must be defines at the column level.CConstraints can be created after the table is created.DConstraints can be created at the same time the table is created.EInformation about constraints is found in the VIEW_CONSTRAINTS dictionary view.
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多选题Which two statements are true regarding views?()AA subquery that defines a view cannot include the GROUP BY clauseBA view that is created with the subquery having the DISTINCT keyword can be updatedCA view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updatedDA data manipulation language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table
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多选题Which statements are true regarding system-partitioned tables?()AOnly a single partitioning key column can be specified.BAll DML statements must use partition-extended syntax.CThe same physical attributes must be specified for each partition.DUnique local indexes cannot be created on a system-partitioned table.ETraditional partition pruning and partitionwise joins are not supported on these tables.
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多选题You execute this command to drop the ITEM table, which has the primary key referred in the ORDERS table:SQL DROP TABLE scott.item CASCADE CONSTRAINTS PURGE; Which two statements are true about theeffect of the command()ANo flashback is possible to bring back the ITEM table.BThe ORDERS table is dropped along with the ITEM table.CThe dependent referential integrity constraints in the ORDERS table are disabled.DThe dependent referential integrity constraints in the ORDERS table are removed.EThe table definition of the ITEM table and associated indexes are placed in the recycle bin
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单选题When defining a referential constraint between the parent table T2 and the dependent table T1, which of the following is true?()A
The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.B
The list of column names in the FOREIGN KEY clause can be a subset of the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.C
The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T2 or a UNIQUE constraint that exists on T2.D
The list of column names in the FOREIGN KEY clause must be identical to the list of column names in the primary key of T1 or a UNIQUE constraint that exists on T1.
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