Adding the last of the Casting Lesson

Lessons/1.20/1.20_Data_types.sql

@@ -0,0 +1,80 @@
+SELECT 
+* 
+FROM information_schema.columns;
+
+SELECT 
+    table_name,
+    column_name,
+    data_type
+FROM information_schema.columns
+WHERE table_name = 'job_postings_fact';
+
+DESCRIBE job_postings_fact;
+
+DESCRIBE
+SELECT 
+    job_title_short,
+    salary_year_avg
+FROM job_postings_fact;
+
+DESCRIBE
+SELECT 
+*
+FROM job_postings_fact;
+
+SELECT CAST ('2023-4-20' AS DATE);
+
+SELECT 
+    job_id,
+    CAST(job_work_from_home AS INT) AS job_work_from_home,
+    CAST(job_posted_date AS DATE) AS job_posted_date,
+    CAST(salary_year_avg AS DECIMAL(10,0)),
+FROM 
+    job_postings_fact
+WHERE salary_year_avg IS NOT NULL
+ORDER BY salary_year_avg DESC
+LIMIT 15;
+
+-- SELECT 
+--     job_id,
+--     CAST(job_work_from_home AS INT) AS job_work_from_home,
+--     CAST(job_posted_date AS DATE) AS job_posted_date,
+--     CAST(MAX(salary_year_avg) AS DECIMAL(10,0)) AS salary_year_avg
+-- FROM 
+--     job_postings_fact
+-- WHERE 
+--     salary_year_avg IS NOT NULL
+-- GROUP BY 
+--     job_id, job_work_from_home, job_posted_date
+-- ORDER BY 
+--     salary_year_avg DESC
+-- LIMIT 15;
+
+SELECT 
+    CAST(job_id AS VARCHAR) || '-' || CAST(company_id AS VARCHAR),
+    CAST(job_work_from_home AS INT) AS job_work_from_home,
+    CAST(job_posted_date AS DATE) AS job_posted_date,
+    CAST(salary_year_avg AS DECIMAL(10,0)),
+FROM 
+    job_postings_fact
+WHERE salary_year_avg IS NOT NULL
+LIMIT 15; 
+
+
+SELECT 
+    job_id::VARCHAR|| '-' ||company_id::VARCHAR AS id,
+    job_work_from_home::INT AS job_work_from_home,
+    job_posted_date::DATE AS job_posted_date,
+    salary_year_avg::DECIMAL(10,0) AS salary_year_avg,
+FROM 
+    job_postings_fact
+WHERE salary_year_avg IS NOT NULL
+LIMIT 15;
+
+
+SELECT *
+FROM job_postings_fact
+LIMIT 100;
+
+
+