Question

a table loadcount have two attributes did and count.i need to select did where the count is lowest. for example if:

 did        count
 657        0
 698        1

then 657 has to be returned. similary if two rows have same count value and both are lowest then one of them needs to be selected at random.plzz help me.My academic project submission deadline is very near and i couldnt figure it on my own.Plzz provide me with codes,sql query.I am using microsoft access and java for the project.

Answer 1

you can use the MIN function to find the lowest one

SELECT MIN(expression)
FROM tables
WHERE predicates

so in this case it would be

SELECT MIN(count) as "Lowest Count"
FROM tableName

to select a random cell from the MIN info returned , it depends on what you are using MySQl, PostgreSQL, etc…

Select a random row with MySQL:

SELECT MIN(count) as "Lowest Count"
FROM tableName
ORDER BY RAND()
LIMIT 1

Select a random row with PostgreSQL:

SELECT MIN(count) as "Lowest Count"
FROM tableName
ORDER BY RANDOM()
LIMIT 1

Select a random row with Microsoft SQL Server:

SELECT TOP 1 MIN(count) as "Lowest Count"
FROM tableName
ORDER BY NEWID()

Select a random row with IBM DB2

SELECT MIN(count), RAND() as "Lowest Count"
FROM tableName 
ORDER BY IDX FETCH FIRST 1 ROWS ONLY

Select a random record with Oracle:

SELECT MIN(count)
( SELECT MIN(count)
FROM tableName
ORDER BY dbms_random.value )
WHERE rownum = 1