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SQL PLSQL Interview Questions
Questions Answers Views Company eMail

Is not null in sql?

936

What does the sign mean in sql?

930

Is sql between inclusive?

1073

What is aggregate function in sql?

996

What is the difference between in and between in sql?

1008

Are stored procedures faster than dynamic sql?

993

What is an inner join sql?

966

What is the use of <> sql?

937

Are subqueries better than joins?

929

Can you inner join the same table?

946

What is a join query?

910

What is the difference between inner join and natural join?

962

What is the difference between join and natural join?

889

When to use inner join and left join?

915

Why do we use joins?

990


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Un-Answered Questions { SQL PLSQL }

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

2300


How do I edit a trigger in sql developer?

943


Why stored procedure is faster than query?

964


Can we join tables without foreign key?

915


Can we write ddl statements in functions?

1058


Does truncate require commit?

925


How is a process of pl/sql compiled?

1094


What do you understand by pl/sql cursors?

1033


What is the difference between null value, zero, and blank space?

1148


What is crud sql?

932


How do you select unique values in sql?

952


What are the popular database management systems in the it industry?

938


How can you view the errors encountered in a trigger?

924


What are the built in functions of sql?

991


What are the set operators in sql?

1038