SpirirHost Support Centre: MySQL Reference Manual p.145

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Table of Contents
1. General Information
2. MySQL Installation
3. Tutorial Introduction
4. Database Administration
5. MySQL Optimisation
6. MySQL Language Reference
7. MySQL Table Types
8. MySQL APIs
9. Extending MySQL

Chapter 3: Tutorial Introduction 145 Some MySQL installations allow users to connect as the anonymous (unnamed) user to the server running on the local host. If this is the case on your machine, you should be able to connect to that server by invoking mysql without any options: shell> mysql After you have connected successfully, you can disconnect any time by typing QUIT at the mysql> prompt: mysql> QUIT Bye You can also disconnect by pressing Control-D. Most examples in the following sections assume you are connected to the server. They indicate this by the mysql> prompt. 3.2 Entering Queries Make sure you are connected to the server, as discussed in the previous section. Doing so will not in itself select any database to work with, but that's okay. At this point, it's more important to nd out a little about how to issue queries than to jump right in creating tables, loading data into them, and retrieving data from them. This section describes the basic principles of entering commands, using several queries you can try out to familiarise yourself with how mysql works. Here's a simple command that asks the server to tell you its version number and the current date. Type it in as shown here following the mysql> prompt and press Enter: mysql> SELECT VERSION(), CURRENT_DATE; +--------------+--------------+ | VERSION() | CURRENT_DATE | +--------------+--------------+ | 3.22.20a-log | 1999-03-19 | +--------------+--------------+ 1 row in set (0.01 sec) mysql> This query illustrates several things about mysql: A command normally consists of a SQL statement followed by a semicolon. (There are some exceptions where a semicolon is not needed. QUIT, mentioned earlier, is one of them. We'll get to others later.) When you issue a command, mysql sends it to the server for execution and displays the results, then prints another mysql> to indicate that it is ready for another command. mysql displays query output as a table (rows and columns). The rst row contains labels for the columns. The rows following are the query results. Normally, column labels are the names of the columns you fetch from database tables. If you're retrieving the value of an expression rather than a table column (as in the example just shown), mysql labels the column using the expression itself. mysql shows how many rows were returned and how long the query took to execute, which gives you a rough idea of server performance. These values are imprecise because

MySQL Reference Manual

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