Which one of the following is a reason that an INSERT
statement might cause an error instead of executing
correctly?
1. The INSERT statement was attempting to insert a record
into a view that was created from more than one table.
2. The INSERT statement was attempting to insert a record
using a combination of constants and values from an
existing table.
3. The INSERT statement was attempting to insert a record
with a non-NULL value into a table that has that column
defined as NULL.
4. The INSERT statement was attempting to insert a record
into a table by selecting a record from that same table.
5. The INSERT statement was attempting to insert a record
into a view rather than a table.
SELECT flavor, SUM (ice_cream_sales) FROM sales_detail
GROUP BY flavor ORDER BY 2 DESC
If the "sales_detail" table contains ten records with
different values in the flavor column (two "vanilla,"
three "chocolate," four "strawberry," and one NULL), how
many rows are returned by the sample code above?
1. 0 rows
2. 1 row
3. 3 rows
4. 4 rows
5. 10 rows
1 SELECT a.field1, b.field2, c.field3, d.field4
2 FROM atable a, atable b, ctable c, dtable d
3 ?
4 ORDER BY 1
What is the minimum number of joins that must be specified
on line 3 in the sample code above to properly link the
tables? Notice that the table "atable" is aliased twice:
once as "a" and once as "b."
1. One join
2. Two joins
3. Three joins
4. Four joins
5. Five joins
What is the main difference between a UNION statement and a
UNION ALL statement?
1. A UNION statement eliminates duplicate rows; a UNION
ALL statement includes duplicate rows.
2. A UNION statement can be used to combine any number of
queries; a UNION ALL statement can be used to combine a
maximum of two queries.
3. A UNION statement can only combine queries that have
parallel fields in the SELECT list; a UNION ALL statement
can combine queries with differing SELECT list structures.
4. A UNION statement cannot be used with aggregate
functions; a UNION ALL statement can be used with aggregate
functions.
5. There is no difference between the two statements; they
are interchangeable.
What is the difference between UNIQUE CONSTRAINT and
PRIMARY KEY?
1. There is no difference.
2. A PRIMARY KEY cannot be declared on multiple columns.
3. A UNIQUE CONSTRAINT cannot be declared on multiple
columns.
4. A table can have multiple PRIMARY KEYS but only one
UNIQUE CONSTRAINT.
5. A table can have multiple UNIQUE CONSTRAINTs but only
one PRIMARY KEY.
Which clause of an UPDATE statement allows you to affect
only certain rows of a table?
1. The WHERE clause
2. The SET clause
3. The ROWS AFFECTED clause
4. The ORDER BY clause
Which one of the following pairs of aggregate functions do
you use with character fields?
1. COUNT(field) and MAX(field)
2. AVG(field) and COUNT(field)
3. MIN(field) and SUM(field)
4. AVG(field) and MAX(field)
5. COUNT(field) and SUM(field)
Which one of the following join types will always create a
Cartesian Product?
1. CROSS JOIN
2. LEFT OUTER JOIN
3. RIGHT OUTER JOIN
4. FULL OUTER JOIN
5. INNER JOIN
How are multiple column = value pairs delimited in the SET
clause of an UPDATE statement?
1. With commas (SET price = 0, status = 'I')
2. With parentheses (SET (price = 0) (status = 'I'))
3. With double-pipes (SET price = 0 || status = 'I')
4. With square-brackets (SET [price = 0] [status = 'I']
5. With single or multiple spaces (SET price = 0 status
= 'I')
SELECT category, type, AVG(price)
FROM products GROUP BY category, type ORDER BY 1, 2
If there are three distinct categories in the "products"
table, and each one has five different types, how many rows
are returned by the query above?
1. 1 row
2. 3 rows
3. 5 rows
4. 8 rows
5. 15 rows
If i can use sys.check_constraints to display my constraints
from my database using sql server 2005, how can i display
then if i am using sql server 2000????
63
Which one is the Best approach to put code, among Triggers
and Procedures? Explain?
Hi,
I am new in oracle(SQL), could anyone help me in writing a
correct SQL.
Below is the table structure.
Table: Subsc
Fields:
1. Sub_no (this field will hold values of subscriber nos,
for e.g. S111111, S222222, S333333, S444444, etc.)
2. s_status (this field will hold values for different
status of subscriber, for e.g. 'A', 'S', 'C', etc.)
3. cus_id (this field will hold values of bill nos for e.g.
11111111, 22222222, 33333333, 44444444, etc.)
Table: Bill
Fields:
1. Bill_no this field will hold values of bill nos for e.g.
11111111, 22222222, 33333333, 44444444, etc.)
2. b_status = (this field will hold values for different
status of bill for e.g. 'O', 'C', 'S', etc.)
Note:
1. The Sub_no is a Primary key of Subsc table.
2. The cus_id is a foreign in Subsc table (referred from
Bill_no field of Bill table)
3. The Bill_no field is the Primary key of Bill table.
Query A --> I wrote a query to select cus_id/Bill_no which
is in status open (b_status = 'O') and having more than two
active subscriber (i.e. S_status = 'A') in it ( i.e. more
the two subscribers in same bill).
select s.cus_id
from subsc s
where exists (select 1 from bill
where bill_no = s.cus_id
and b_status = 'O')
and s_status = 'A'
group by s.cus_id
having count(sub_no) = 2
Problem : The above query will give the cus_id (or rather
bill_no) which are in open status (b_status ='O) and which
are having TWO ACTIVE Subscribers (s_status ='A') in it.
However, this query will also lists the cus_id/bill_no
which are having more than TWO subscribers in it
(but only two subscriber will be in Active status (s_status
= 'A') and the others will be in s_status = 'C' or s_status
= 'S'.
Help needed: I want to write a query which will fetch ONLY
the cus_id/bill_no which are in open status (b_status ='O')
and which are having ONLY TWO ACTIVE subscribers (s_status
='A') in it.
B--> If I include the sub_no in the above query then NO row
are returned.
select s.cus_id, s.sub_no
from subsc s
where exists (select 1 from bill
where bill_no = s.cus_id
and b_status = 'O')
and s_status = 'A'
group by s.cus_id, s.sub_no
having count(sub_no) = 2
Help needed: I want to modify the above query which will
fetch ONLY the cus_id/bill_no which are in open status
(b_status ='O') and which are having ONLY TWO ACTIVE
subscribers (s_status ='A') in it ALONG with the sub_no.
Thanks a lot in advance.
Regards,
Nitin
40
what is the use of anchoring object? what r the difference
between anchoring object & enclosing object? can any one
tell me all the details?
47
oracle is compiler or interpretter,can any one tell me the
answer?
1071
what is the bond code in materialized view?
71
What action do you have to perform before retrieving data
from the next result set of a stored procedure ?
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