PL/SQL Create Trigger for provided tables
Create a trigger on the rental table that triggers when the return time is updated from null to a new return time. The trigger must update the tool table to increase the quantity of the corresponding tool by one and print a message saying ‘tool X’s quantity is now y’ where x is tool name, y is new quantity. Name the trigger return_rental_trigger.Rental Table & Tool Table are on attached doc
CREATE TABLE rental (
rid int NOT NULL,
cid varchar(30) NULL,
tid varchar(30) NULL,
tuid int NULL,
num_unit int NULL,
start_time timestamp NULL,
end_time timestamp NULL,
return_time timestamp NULL,
credit_card int NULL,
total float NULL,
CONSTRAINT rental_pk PRIMARY KEY (rid),
CONSTRAINT rental_fk FOREIGN KEY (cid) REFERENCES cust(cid),
CONSTRAINT rental_fk_1 FOREIGN KEY (tid) REFERENCES tool(tool_id),
CONSTRAINT rental_fk_2 FOREIGN KEY (tuid) REFERENCES time_unit(tuid)
tool_id varchar(30) NOT NULL,
tname varchar(30) NULL,
ctid varchar(30) NULL,
quantity float(10) NULL,
CONSTRAINT tool_pk PRIMARY KEY (tool_id),
CONSTRAINT tool_fk FOREIGN KEY (ctid) REFERENCES category(ctid)
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