Dbschema set primary key
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(2) Next, the script creates a database trigger, that automatically inserts into a relational table created in the previous step, a key of a new order and a name of a user who created the order. (1) First, the script creates a relational table to store information about a new order key and a name of user who created a new order. Implement SQL script solution1.sql that performs the following actions. If you skipped the Prologue section of specification Laboratory 4 then it is recommended to read it now. An item can be added to an order only by a user who created the order. Tasks Task 1 (1 mark) Automatic recording of information in a database In this task we implemented the first part of a system that verifies the following access control rule. If such access control rule is violated then the trigger aborts a transaction that attempted to insert a new item. The trigger must check if a user who attempts to insert the item is the same user who inserted an order into which the new item must be inserted. In the second step, we implement a database trigger that fires when a new item is added to an order. If an order is deleted then information about a user who earlier created an order to be deleted must be removed from the table together with an order key. Then, we implement a database trigger that automatically inserts information about a user and about an order key into the new table whenever a new order is added. We add a new relational table to store information about the names of users and the orders created by the users.
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To implement the access control rule listed above we have to extend the structures of a sample database a bit. The objective of this laboratory is use database triggers to implement the following access control rule. No report is expected from the implementations of the actions listed in Prologue. To try it, connect to one of Oracle 19c servers and process the following statement: SELECT USER FROM DUAL The system supposed to return a name of a user you are connected as. It is possible to use a pseudo-column USER to find a name of user you are connected as. A conceptual schema of a sample database is included in a file dbschema.bmp. To load data into a sample database, process as script dbload.sql. To drop a sample database, process a script dbdrop.sql. To create a sample database, process as script dbcreate.sql.
#Dbschema set primary key download#
Transcribed image text: Prologue Download the files dbschema.bmp, dbcreate.sql, dbload.sql, and dbdrop.sql included in a section SAMPLE DATABASES on Moodle. Show transcribed image text Expert Answer (O_CUSTKEY)REFERENCES CUSTOMER(C_CUSTKEY),ĬONSTRAINT ORDER_CHECK1 CHECK( O_TOTALPRICEĬONSTRAINT LINEITEM_CHECK1 CHECK (L_QUANTITYĬONSTRAINT LINEITEM_CHECK3 CHECK (L_TAX >=ĬONSTRAINT LINEITEM_CHECK4 CHECK (L_DISCOUNT (O_ORDERKEY),CONSTRAINT ORDERS_FKEY1 FOREIGN kEY (C_NATIONKEY)REFERENCES NATION(N_NATIONKEY),ĬONSTRAINT CUSTOMER_CHECK1 CHECK(C_CUSTKEY >=
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NULL,CONSTRAINT CUSTOMER_PKEY PRIMARY KEY(C_CUSTKEY), (P_PARTKEY), CONSTRAINT PART_CHECK1 CHECK(P_PARTKEY >=Ġ),CONSTRAINT PART_CHECK3 CHECK(P_RETAILPRICE >= 0) ) ĬONSTRAINT SUPPLIER_CHECK1 CHECK(S_SUPPKEY >=ĬONSTRAINT PARTSUPP_CHECK1 CHECK(PS_PARTKEYĬONSTRAINT PARTSUPP_CHECK2 CHECK(PS_AVAILQTYĬONSTRAINT PARTSUPP_CHECK3 CHECK(PS_SUPPLYCOST NOT NULL,CONSTRAINT PART_PEKEY PRIMARY KEY * The relational tables of TPC HR benchmark databaseĬONSTRAINT REGION_CHECK1 CHECK(R_REGIONKEY >=ĬONSTRAINT NATION_CHECK1 CHECK(N_NATIONKEY >=