MySQL getting started (2) getting started

The previous article explains how to install and test MySQL. After the environment is set up, we can continue our learning. This article is familiar with Common commands.

1. Start the MySQL server. In fact, the previous article describes how to start MySQL. Two Methods: one is to use winmysqladmin. If the machine runs automatically at startup, you can directly go to the next step. Second, Run d: mysqlbinmysqld in DOS mode.

2. Enter the mysql interactive operation interface. Run "d: mysqlbinmysql" in DOS mode. The prompt "mysql" appears. The interactive operation mode of mysql is displayed. If "ERROR 2003: Cant connect to MySQL server on localhost (10061)" appears, your MySQL has not been started.

3. log out of MySQL. Enter quit at the mysql> prompt to exit the interaction interface at any time: mysql> quit Bye. You can also use control-D to exit.

4. The first command mysql> select version (), current_date (); + ---------------- + ----------------- + | version () | current_date () | + ---------------- + --------------- + | 3.23.25a-debug | 2001-05-17 | + ---------------- + ----------------- + 1 row in set (0.01 sec) mysql> This Command requires the mysql server to tell you its version number and current date. Run the preceding command in different cases to check the result. The results show that the case sensitivity of the mysql Command is consistent. Exercise the following operations: mysql> Select (20 + 5) * 4; mysql> Select (20 + 5) * 4, sin (pi ()/3 ); mysql> Select (20 + 5) * 4 AS Result, sin (pi ()/3); (AS: Specify the alias AS Result)

5. A command with multiple lines of statements can be divided into multiple lines of input until the Semicolon ";" is displayed: mysql> select-> USER ()->,-> now ()->; + -------------------- + users + | USER () | now () | + -------------------- + users + | ODBC @ localhost | 22:59:15 | + -------------------- + rows + 1 row in set (0.06 sec) mysql> note the use of commas (,) and semicolons (,) in the middle.

6. Run the following command in one line: mysql> select user (); select now (); + ---------------- + | USER () | + ------------------ + | ODBC @ localhost | + ------------------ + 1 row in set (0.00 sec) + --------------------- + | NOW () | + --------------------- + | 23:06:15 | + ----------------------- + 1 row in set (0.00 sec) mysql> note the semicolons in the middle, which are separated by semicolons.

7. display the current Database mysql> show databases; + ---------- + | Database | + ---------- + | mysql | test | + ---------- + 2 row in set (0.06 sec) mysql>

8. Select a Database and display the currently selected Database mysql> USE mysql Database changed mysql> (USE and QUIT commands do not need to end with a semicolon .) Mysql> select database (); + --------------- + | database () | + ----------------- + | mysql | + --------------- + 1 row in set (0.00 sec)

9. display the TABLES in the current database mysql> show tables;

10. display the table (db) content mysql> select * from db;

11. Command cancellation when the command input is incorrect and cannot be changed (multi-line statements, you can use c to cancel the command mysql> select-> user ()-> c mysql> before the semicolon appears. This is the most common and basic operation command, after multiple exercises, you can stick to your hand.