Introduction to MySQL /MariaDB and SQL Basics Read …

[Pages:51]Introduction to MySQL /MariaDB and SQL Basics

Read Chapter 3!





MySQL / MariaDB

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09/16/19

Pacific University

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College Database E-R Diagram

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09/16/19

Pacific University

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Database tasks



start MariaDB

? setup user passwords

shutdown MariaDB create database create table

? primary key ? index ? foreign key

insert data

? source a file

delete data

? drop

query data

? where ? join ? group ? order ? subquery

*Coding standards on the class web page!

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09/16/19

Pacific University

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MariaDB

ssh to db.cs.pacificu.edu (64.59.233.245) ssh -X db.cs.pacificu.edu

[you@db ~]# $ mysql -u PUNetID -p mysql> set password = PASSWORD('NEWPASSWORD'); mysql> show databases;

mysql> use PUNetID_test;

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09/16/19

Pacific University

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Data types



TINYINT/SMALLINT/INT/BIGINT SIGNED/UNSIGNED

BIT

FLOAT/DOUBLE

BOOLEAN

CHAR / BINARY

VARCHAR(###)

/

VARBINARY(###)

DATE / TIME / DATETIME / TIMESTAMP

[TINY|MEDIUM|LONG]TEXT

[TINY|MEDIUM|LONG]BLOB

ENUM

SET 09/16/19

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M

"M indicates the maximum display width for integer types. The maximum display width is 255. Display width is unrelated to the range of values a type can contain, ... .

For floating-point and fixed-point types, M is the total number of digits that can be stored."



CS445

09/16/19

Pacific University

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Strings

Character Set

? set of characters (ASCII, UTF8, ...

Collation

? the order of the characters within the set

MariaDB [will4614_test]> show variables like 'character_set_server';

+----------------------+-------+

| Variable_name

| Value |

+----------------------+-------+

| character_set_server | utf8 |

+----------------------+-------+

1 row in set (0.00 sec)

MariaDB [will4614_test]> show variables like 'collation_server';

+------------------+-----------------+

| Variable_name | Value

|

+------------------+-----------------+

| collation_server | utf8_general_ci |

+------------------+-----------------+

1 row in set (0.01 sec)





CS445

09/16/19

Pacific University

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Create Table

CREATE TABLE People (

PersonID INT NOT NULL AUTO_INCREMENT,

FName VARCHAR(50),

LName VARCHAR(50),

Login VARCHAR(20) NOT NULL,

CONSTRAINT People_PersonID_PK PRIMARY KEY (PersonID),

CONSTRAINT People_Login_U UNIQUE (Login)

) Engine=InnoDB CHARACTER SET = utf8 COLLATE = utf8_bin;

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09/16/19

Pacific University

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