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Aggregating Data Using Group Functions

Aggregating Data Using Group Functions

Aggregating Data Using Group Functions. What Are Group Functions?. EMP. Group functions operate on sets of rows to give one result per group. DEPTNO SAL --------- --------- 10 2450 10 5000 10 1300 20 800 20 1100

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444 views • 31 slides
The Optimizer

The Optimizer

The Optimizer. How ORACLE optimizes SQL statements. David Konopnicky 1997, Revised by Mordo Shalom 2004. What is optimization?. Whenever a DML statement is issued, ORACLE must determine how to execute it. There may be different ways to execute the statement.

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316 views • 31 slides
Logging into the gateway server

Logging into the gateway server

Lab 3: Aggregate Functions, Group By & Having Clauses TA City University of Hong Kong. Logging into the gateway server. In our lab, we are going to do operations to Oracle Server through Unix System, so you are required to log into Unix first:

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298 views • 21 slides
SELECT Statements

SELECT Statements

SELECT Statements. Lecture Notes Sree Nilakanta Fall 2010 (rev). SELECT Statements. Retrieve data from one or more tables, object tables, views, object views, or snapshots Must have SELECT privilege Examples. Examples.

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314 views • 20 slides
Subqueries

Subqueries

Subqueries. Objectives. After completing this lesson, you should be able to do the following: Describe the types of problems that subqueries can solve Define subqueries List the types of subqueries Write single-row and multiple-row subqueries. Using a Subquery to Solve a Problem.

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541 views • 18 slides

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