Hi experts,,
Can any one help me to understand the mechanism of select statement or how to start thinking of solving a select statement.. for example how to think of a select statement that brings the second heights salary in the company ... really i need to understand how select statement works please i need help here
Thanx
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No, you do not need to know what happens behind the scene.
Only some rules.
sal is the salary column
salary is the table that contains salaries
rownum is pseudocolumn that ordered the result set
order by means sort values of the column sal
In fact I did an error:
SELECT sal
FROM salary
WHERe rownum = 2
ORDER BY sal DESC;
DESC means descending.
there is many function used in SQL statement like :
aggregate function
1- sum
2- count
3- max
4- min
5- avg
string function
1- lower
2- upper
3- substr
4- instr
you will write like this statement
select max(sal) from emp
where sal <>(select max(sal) from emp)
change the name of column as the same name in your table
Business Accounts
Answer for Membership
by: schwertnerPosted on 2006-07-04 at 05:38:05ID: 17036648
You have to think using SETS.
Imagine a table as set of rows and columns.
You can select SUBSET of rows and/or columns.
You can join set from one table with set from other table using different techniques - joins, Union, Minus set operations.