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SQL Data Definition Language (DDL) 2008-06-17 04:14:55 The Data Definition
Language (DDL) part of SQL
permits database tables to be created or deleted. We can also define indexes (keys), specify links between tables, and impose constraints between database tables.
The most important DDL statements in SQL are: CREATE TABLE - creates a new database table ALTER TABLE - alters (changes) a database table DROP TABLE - deletes a database table CREATE INDEX..
SQL Data Manipulation Language (DML) 2008-06-17 04:13:34 SQL (Structured Query Language) is a syntax for executing queries. But the SQL language also includes a syntax to update, insert, and delete records.
These query and update commands together form the Data Manipulation
Language (DML) part of SQL:SELECT - extracts data from a database table UPDATE - updates data in a database table DELETE - deletes data from a database table INSERT INTO - inserts... Read more:SQL
SQL Database Tables & SQL Queries 2008-06-17 04:09:14 SQL DatabaseTables
A database most often contains one or more tables. Each table is identified by a name (e.g. "Customers" or "Orders"). Tables contain records (rows) with data
SQL Queries
With SQL, we can query a database and have a result set returned.
A query like this:
SELECT LastName FROM Persons
Note: Some database systems require a semicolon at the end of the SQL statement. We don't use... Read more:SQL
SQL is a Standard - BUT.... 2008-06-17 04:07:16 SQL is an ANSI (American National Standard
s Institute) standard computer language for accessing and manipulating database systems. SQL statements are used to retrieve and update data in a database. SQL works with database programs like MS Access, DB2, Informix, MS SQL Server, Oracle, Sybase, etc.
Unfortunately, there are many different versions of the SQL language, but to be in compliance with...
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What is SQL? 2008-06-17 04:05:29 SQL is a standard computer language for accessing and manipulating databases.SQL stands for Structured Query Language SQL allows you to access a database SQL is an ANSI standard computer language SQL can execute queries against a database SQL can retrieve data from a database SQL can insert new records in a database SQL can delete records from a database SQL can update records in a database SQL... Read more:SQL
SQL SELECT Command 2008-06-18 02:35:07 SQL SELECT Command is without a doubt the most frequently used SQL command that’s why we are starting our tutorial with it. The SQL SELECT command is used to retrieve data from one or more database tables.
To illustrate the usage of the SELECT command we are going to use the Users table defined in the previous...
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