MySQL Tables and Relations 101

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Presentation transcript:

MySQL Tables and Relations 101 * Lecture 17 MySQL Tables and Relations 101 * Course logo spider web photograph from Morguefile openstock photograph by Gabor Karpati, Hungary.

CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz Data - Tables Table is, more or less, a flat database. Contains “things”, objects. One thing per row. Columns store attributes. Primary index unique for each row. Relations kick in later How we relate tables to one another. 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

Exercise Some Commands use CREATE INSERT SELECT UPDATE DROP id name artist 1 Mudlark Leo Kottke 2 My Feet Are Smiling 3 Lucky The Man Wizz Jones 4 The Blue Idol Altan 5 Return of the Repressed John Fahey 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

Create Music Database In general, new databases do not come and go often. 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz Example 1 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

Where’s the Beef, ah … Data. Data from tables is stored in files. Case sensitivity comes from host OS. In case it is not obvious. NEVER MANIPULATE THESE FILES DIRECTLY. 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

Relations 101 Leo Kottke appears twice. Leo Kottke Wizz Jones Altan John Fahey The Blue Idol Mudlark Lucky The Man My Feet Are Smiling Return of the Repressed 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz Example 2 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz

Keys: Primary and Foreign Primary Key Unique! Establishes Relation: Loosely speaking, a ‘pointer’ to the other object. Two cds related to one artist. 11/22/2018 CSU CS CT 310 - Web Development, ©Ross Beveridge & Jamie Ruiz