What is the difference between UNIQUE and DISTINCT keywords in DBMS?
Answer Posted / anjaligarg
First we declare is as primary key and after group by we can get uniqu values.
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
PRIMARY KEY (ID)
);
SELECT ID, LastName,FirstName
FROM Persons
GROUP BY ID, LastName,FirstName;
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
How to connect php with different port numbers?
How can we solve concurrency problems?
Does view occupy space?
What are the source of constraints?
Can we make the the chages By Using the Sql if u know any function or process please inform me Actuall result: BRK1 Break 1 Part 1 00:01:00:00 60 BRK1 Break 1 Part 2 00:01:00:00 60 BRK2 Break 2 Part 1 00:01:00:00 60 BRK2 Break 2 Part 2 00:01:00:00 60 BRK2 Break 2 Part 3 00:01:00:00 60 BRK3 Break 3 Part 1 00:01:00:00 60 BRK3 Break 3 Part 2 00:01:00:00 60 Desired O/P: BRK1 Break 1 Part 1 00:01:00:00 60 Part 2 00:01:00:00 60 BRK2 Break 2 Part 1 00:01:00:00 60 Part 2 00:01:00:00 60 Part 3 00:01:00:00 60
What are the risks of storing a hibernate-managed object in a cache? How do you overcome the problems?
What are wait types?
What is an indexed view?
What is acid mean in sql server?
List out the different types of locks available in sql server?
This question asked during interview, 2) At the end of each month, a new table is created for each bank that contains monthly metrics consolidated at the account level. The table naming convention is bankX_YYYYMM where X represents the numeric designation of the bank and YYYYMM indicates the 4 digit year and 2 digit month. The tables contain the following fields: name data type description account text account number registered boolean indicates whether the account is registered num_trans integer number of transactions made during the time period spend numeric(9,2) total spend during the time period a) Write a SQL query that will display the total number of transactions and total spend for "Bank1" during the 4th quarter of 2009. b) Write a SQL query that will display the total number of transactions and total spend at "Bank1" and "Bank2", broken out by registered vs. non-registered accounts, during January 2010 not sure what is correct answer and how to solve?
Disadvantages of the indexes?
How efficient you are in oracle and SQL server?
Why should you use or avoid select * statements?
What is a scheduled job or what is a scheduled task?