Database tables: A database usually contains one or more tables, each table is identified by a name such as "class" or "students". Tables contain records (rows) with data.
SQL Statements: The most of the performance you do on database is completed by SQL Statement.
Note: SQL is not case sensitive.
Some database system requires semicolon at the end of each SQL command, but it's not a necessity. Semicolon is the standard method to separate each SQL Statement and enable that one or more SQL statements can be performed in one same Servers command.
Some database system doesn't require semicolon such as MS Access and SQL Server 2000.
SQL is divided into DML (Data Manipulation Language) and DDL (Data Definition Language). The query and update commands constitute DML part (SELECT, UPDATE, DELETE, INSERT INTO). DDL enables us to create and delete tables. It also defines indexes (keys), specifies links between tables, and imposes constraints between tables. Some important DDL statements in SQL: CREATE DATABASE, ALTER DATABASE, CREATE TABLE, ALTER TABLE, DROP TABLE, CREATE INDEX, DROP INDEX.
Previous article is SQL introduction.
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