SQL Exercises (with answers) Give the SQL commands for the following and answer any associated questions: (A) “Simple” SELECT Command Questions 1. Display all information in the tables EMP and DEPT. SELECT * FROM emp; SELECT * FROM dept; 2. 3. 4. 5. 6. 7. Display only the hire date and employee name for each employee. SELECT hiredate‚ ename FROM emp; Display the hire date‚ name and department number for all clerks. SELECT hiredate‚ ename‚ deptno FROM emp WHERE job = ’CLERK’; Display the names and
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Oracle Table Triggers Version 11.1 General Data Dictionary Views Related To DDL Triggers trigger$ dba_triggers all_triggers user_triggers System Privileges Related To Table Triggers create trigger create any trigger administer database trigger alter any trigger drop any trigger Table Trigger Firing Options -- before constraints are applied BEFORE INSERT BEFORE UPDATE BEFORE DELETE -- after constraints are applied AFTER INSERT AFTER UPDATE AFTER DELETE Transaction
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1. SELECT e.ename‚ e.deptno‚ d.dname‚ d.deptno FROM dept d LEFT OUTER JOIN emp e ON d.deptno = e.deptno ORDER BY d.deptno; SQL> SELECT e.ename‚ e.deptno‚ d.dname‚ d.deptno 2 FROM dept d 3 LEFT OUTER JOIN emp e 4 ON d.deptno = e.deptno 5 ORDER BY d.deptno; ENAME DEPTNO DNAME DEPTNO ---------- ---------- -------------- ---------- MILLER 10 ACCOUNTING 10 KING 10 ACCOUNTING
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Design Patterns FOR DUMmIES by Steve Holzner‚ PhD ‰ Design Patterns FOR DUMmIES ‰ Design Patterns FOR DUMmIES by Steve Holzner‚ PhD ‰ Design Patterns For Dummies® Published by Wiley Publishing‚ Inc. 111 River Street Hoboken‚ NJ 07030-5774 www.wiley.com Copyright © 2006 by Wiley Publishing‚ Inc.‚ Indianapolis‚ Indiana Gamma/Helm/Johnson/Vlissides‚ DESIGN PATTERNS: ELEMENTS OF REUSABLE OBJECT-ORIENTED SOFTWARE‚ © 1995 Pearson Education‚ Inc. Reprinted
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SELECT statement with syntax‚ examples‚ and practice exercises. Description The SQL SELECT statement is used to retrieve records from one or more tables in your SQL database.សេចក្តីថ្លែងការណ៍ SQL ដែលបានជ្រើសត្រូវបាន ប្រើដើម្បីទាញយកកំណត់ត្រា ពីតា រាង មួ យឬ ច្រើននៅក្នុងមូលដ្ឋានទិន្នន័យ SQL របស់អ្នក។ Syntax The syntax for the SQL SELECT statement is: SELECT expressions FROM tables WHERE conditions; Example - Select all fields from one table Let’s look at an example showing how to use the SQL
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word Example: Main Module … End Main Module Declare [DataVariableName] As [DataType] - DataVariableName can be any name chosen as long as it is one word - DataType can be one of the following basic types: Float‚ Real‚ Integer (real & integer are numbers)‚ String Example: Declare NumSandwiches As Integer Declare FirstName As String Display (or Write) [String or data variable to be displayed] - If string is used‚ you must have it start and end with quotations Example 1: Display
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records from multiple tables with unions. Subqueries Subqueries are queries embedded in queries. They are used to retrieve data from one table based on data in another table. They generally are used when tables have some kind of relationship. For example‚ in the NorthWind database‚ the Orders table has a CustomerID field‚ which references a customer in the Customers table. Retrieving the CustomerID for a specific order is pretty straightforward. Code Sample 1 /* Find the CustomerID of the company
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Tugas mandiri Andre nanda pratama jaelani‚ 112400161‚ MBTIe CREATE TABLE DEPARTMENT (dept_id VARCHAR (5) NOT NULL‚ Nama_Dept VARCHAR (20) NOT NULL‚ PRIMARY KEY (DEPT_id)); CREATE TABLE PEGAWAI (ID_peg INT (5) NOT NULL‚ Nama_peg VARCHAR (20) NOT NULL‚ Alamat VARCHAR (20) NOT NULL‚ ID_Dept VARCHAR (5) NOT NULL‚ PRIMARY KEY (ID_peg)‚ FOREIGN KEY (ID_Dept) references pegawai (ID_peg)); INSERT INTO Department VALUES (’B001’‚’HRC’)‚ (’B002’‚’IT’)‚ (’B003’‚’FINANCE’)‚ (’B004’‚’LOGISTIC’); INSERT INTO
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conditions listed in the WHERE clause. SELECT "column_name" FROM "table_name" WHERE "simple condition" {[AND|OR] "simple condition"}+ Order By The SQL ORDER BY clause comes in handy when you want to sort your SQL result sets by some column(s). For example if you want to select all the persons from the already familiar Customers table and order the result by date of birth‚ you will use the following statement: SELECT "column_name" FROM "table_name" [WHERE "condition"] ORDER BY "column_name" [ASC
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Database management Homework 1 Chapter 1. Getting started A. Create a simple list of owners and properties. B. Describe modification problems. There are three problems. First is deletion problem‚ second is update problem‚ third is insertion problem. Deletion problem is when you want to delete data‚ you may lost too much data. Update problem is when you want to update data‚ the sheet may have inconsistent data. Last insertion problem is when you want to insert some data‚ you must
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