Added sql_load files

Author: Ankush-Santra

sql_load/1_create_database.sql

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+CREATE DATABASE sql_course;
+
+-- DROP DATABASE IF EXISTS sql_course;

sql_load/2_create_tables.sql

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+-- Create company_dim table with primary key
+CREATE TABLE public.company_dim
+(
+    company_id INT PRIMARY KEY,
+    name TEXT,
+    link TEXT,
+    link_google TEXT,
+    thumbnail TEXT
+);
+
+-- Create skills_dim table with primary key
+CREATE TABLE public.skills_dim
+(
+    skill_id INT PRIMARY KEY,
+    skills TEXT,
+    type TEXT
+);
+
+-- Create job_postings_fact table with primary key
+CREATE TABLE public.job_postings_fact
+(
+    job_id INT PRIMARY KEY,
+    company_id INT,
+    job_title_short VARCHAR(255),
+    job_title TEXT,
+    job_location TEXT,
+    job_via TEXT,
+    job_schedule_type TEXT,
+    job_work_from_home BOOLEAN,
+    search_location TEXT,
+    job_posted_date TIMESTAMP,
+    job_no_degree_mention BOOLEAN,
+    job_health_insurance BOOLEAN,
+    job_country TEXT,
+    salary_rate TEXT,
+    salary_year_avg NUMERIC,
+    salary_hour_avg NUMERIC,
+    FOREIGN KEY (company_id) REFERENCES public.company_dim (company_id)
+);
+
+-- Create skills_job_dim table with a composite primary key and foreign keys
+CREATE TABLE public.skills_job_dim
+(
+    job_id INT,
+    skill_id INT,
+    PRIMARY KEY (job_id, skill_id),
+    FOREIGN KEY (job_id) REFERENCES public.job_postings_fact (job_id),
+    FOREIGN KEY (skill_id) REFERENCES public.skills_dim (skill_id)
+);
+
+-- Set ownership of the tables to the postgres user
+ALTER TABLE public.company_dim OWNER to postgres;
+ALTER TABLE public.skills_dim OWNER to postgres;
+ALTER TABLE public.job_postings_fact OWNER to postgres;
+ALTER TABLE public.skills_job_dim OWNER to postgres;
+
+-- Create indexes on foreign key columns for better performance
+CREATE INDEX idx_company_id ON public.job_postings_fact (company_id);
+CREATE INDEX idx_skill_id ON public.skills_job_dim (skill_id);
+CREATE INDEX idx_job_id ON public.skills_job_dim (job_id);

sql_load/3_modify_tables.sql

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+/* ⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️
+Database Load Issues (follow if receiving permission denied when running SQL code below)
+
+NOTE: If you are having issues with permissions. And you get error: 
+
+'could not open file "[your file path]\job_postings_fact.csv" for reading: Permission denied.'
+
+1. Open pgAdmin
+2. In Object Explorer (left-hand pane), navigate to `sql_course` database
+3. Right-click `sql_course` and select `PSQL Tool`
+    - This opens a terminal window to write the following code
+4. Get the absolute file path of your csv files
+    1. Find path by right-clicking a CSV file in VS Code and selecting “Copy Path”
+5. Paste the following into `PSQL Tool`, (with the CORRECT file path)
+
+\copy company_dim FROM '[Insert File Path]/company_dim.csv' WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+\copy skills_dim FROM '[Insert File Path]/skills_dim.csv' WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+\copy job_postings_fact FROM '[Insert File Path]/job_postings_fact.csv' WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+\copy skills_job_dim FROM '[Insert File Path]/skills_job_dim.csv' WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+*/
+
+-- NOTE: This has been updated from the video to fix issues with encoding
+
+COPY company_dim
+FROM 'C:\Program Files\PostgreSQL\16\data\Datasets\sql_course\company_dim.csv'
+WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+COPY skills_dim
+FROM 'C:\Program Files\PostgreSQL\16\data\Datasets\sql_course\skills_dim.csv'
+WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+COPY job_postings_fact
+FROM 'C:\Program Files\PostgreSQL\16\data\Datasets\sql_course\job_postings_fact.csv'
+WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');
+
+COPY skills_job_dim
+FROM 'C:\Program Files\PostgreSQL\16\data\Datasets\sql_course\skills_job_dim.csv'
+WITH (FORMAT csv, HEADER true, DELIMITER ',', ENCODING 'UTF8');