COSC 641
Spring 2007
FSU
SEQUENCE PRACTICE
“TEST” is an Oracle user account
1 – Check data in table Patient
SELECT
*
FROM
Test.Patient;
2 – a. Check to see the list of existing sequences (what do you see and why?))
SELECT
Sequence_Name
FROM
SEQ; --USER_SEQUENCES
b. SELECT
*
FROM
SEQ;
3 – a. Check to see what the current value of sequence P_Seq is.
b. Check to see what the next value of sequence P_Seq is.
4 – Insert one row of data into table Patient.(use P_Seq for AddMin field)
5 – Check the current value of sequence P_Seq.
6 – Display the number of rows, and the current value of the sequence from table Patient.
(What is your conclusion?)
7– a-What are the results of this query and why?
SELECT
Test.P_Seq.CURRVAL, Test.P_Seq.NEXTVAL,
Test.P_Seq.NEXTVAL, Test.P_Seq.CURRVAL
FROM
DUAL;
8- Check data in table Patient
SELECT
*
FROM
Test.Patient;
9 – Create a “Temp10” table with the following fields:
Num
NUMBER
Year
NUMBER
Name
VARCHAR2 (25)
SerialNo
NUMBER
10 – Create a sequence called MySeq; that produce odd numbers.
11 – Check the sequence name, increment by value, cycle flag and last number stored in
the database.(compare the last number with MySeq.CURRVAL)
*12 – Create a script to add a record into table Temp10 with Num = MySeq, Year =
2006, Names, and SerialNo = SerialNo + 1 (Do not use sequence for SerialNo)
13 – Add two records using the script created in 12.
14 – Display how many records exist in Temp10.
15 – Compare the count, last SerialNo, and CurrVal.
16 – Display Year and Num (example 2006–5000) in one field, Name, SerialNo for each
row.
*17 – We would like the next sequence number (MySeq) to be 351; Modify your
sequence. (Do not drop and create the sequence)
18 – Insert a row in Temp10 table using script created in 12
19 – Examine your data in table Temp10