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advanced.md

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+# PostGres - Advanced
+
+## Lesson Objectives - important
+1. Joins
+1. Linking Tables
+1. Alias
+1. Indexes
+1. Constraints
+
+## Lesson Objectives - good to know about
+1. EER Diagrams
+1. Unions
+1. Truncate
+1. Triggers
+1. Views
+1. Functions/Stored Procedures
+1. Transactions
+1. Locks
+1. Privileges
+1. Denormalization
+1. Excel -> CSV -> MySQL
+
+## Important
+
+### Joins
+1. Cross Join
+1. Inner Join
+1. Left Join
+1. Right Join
+1. Full Join
+```sql
+SELECT table1.column1, table2.column2
+FROM table1
+INNER JOIN table2
+ON table1.common_filed = table2.common_field;
+```
+
+### Linking Tables
+1. `http://code.tutsplus.com/articles/sql-for-beginners-part-3-database-relationships--net-8561`
+1. One to One Relationships
+	- each user has one address
+	- only one person at that address
+1. One to Many/Many to One Relationships
+	- customer has many orders
+1. Many to Many Relationships
+	- actors and movies
+1. Self Referncing Relationships
+	- customer referral
+
+### Alias
+```sql
+SELECT t1.column1 as col1, t2.column2 as col2
+FROM table1 as t1
+INNER JOIN table2 as t2
+ON t1.common_filed = t2.common_field;
+```
+
+### Indexes
+1. `CREATE INDEX index_name ON table_name (column_name);`
+1. `CREATE INDEX index_name ON table_name (column1_name, column2_name);`
+1. Primary Key
+
+### Constraints
+1. NOT NULL	
+1. Unique
+1. Foreign Keys
+```sql
+CREATE TABLE companies(
+  id          SERIAL       PRIMARY KEY,
+  name        VARCHAR(16)  NOT NULL UNIQUE,
+  city        VARCHAR(16)
+);
+INSERT INTO companies ( city ) VALUES ('Palo Alto');
+CREATE TABLE people(
+  id          INT          PRIMARY KEY,
+  name        VARCHAR(16)  NOT NULL,
+  email       VARCHAR(32)  NOT NULL UNIQUE,
+  company_id  INT          REFERENCES companies(id)
+);
+```
+
+## Good to Know About
+
+### EER Diagrams
+
+### Unions
+
+### Truncate
+
+### Triggers
+
+### Views
+
+### Functions/Stored Procedures
+
+### Transactions
+
+### Locks
+
+### Privileges
+
+### Denormalization
+
+### Excel -> CSV -> MySQL