adding base for lecture 4 of db course

cst363/.gitignore

@@ -1 +0,0 @@
-lab/

cst363/lab/patients.sql

@@ -0,0 +1,16 @@
+drop table if exists patient;
+
+create table patient (
+  patient_no integer primary key,
+  last_name varchar(64) not null,
+  first_name varchar(64) not null,
+  sex varchar(1) not null,
+  date_of_birth varchar(8) not null,
+  ward integer not null
+);
+
+insert into patient values(454, "Smith",   "John",   "M", "14.08.78", 6);
+insert into patient values(223, "Jones",   "Peter",  "M", "07.12.85", 8);
+insert into patient values(597, "Brown",   "Brenda", "F", "17.06.61", 3);
+insert into patient values(234, "Jenkins", "Alan",   "M", "29.01.72", 7);
+insert into patient values(244, "Wells",   "Chris",  "F", "25.02.95", 6);

cst363/lec/lec3.md

@@ -3,14 +3,14 @@
 ## Relational Algebra and its relation to SQL
 
 ### SELECT
-Used to select rows from some table.
+Used to select columns from some table.
 
 > `SELECT [...] FROM [...]`
 
 > Relational symbol: sigma
 
 ### Projection
-Picks out the columns of a (set of) table(s)
+Picks out the rows of a (set of) table(s)
 
 > `PROJECTION [table...]`
 

cst363/lec/lec4.md

@@ -0,0 +1,15 @@
+# lec4
+
+
+## Lab*
+
+This lecture has some lab questions in the `lec/` dircory named `table1.pdf` *and* some example data called `patients.sql`
+Intro to some sql commands
+
+## Serverless
+
+Instead of having listen server listen for requests to perform actions upon these requests we simply have some databse held on a machina and we perform all of our sql commands on that machine.
+
+For now we'll be dealing with small test db's so that we can practice the commands and observe each one's behavior; this will give you a good feeling of what does what in sqlite3.
+
+