213 lines
8.6 KiB
SQL
213 lines
8.6 KiB
SQL
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-- Practical SQL: A Beginner's Guide to Storytelling with Data
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-- by Anthony DeBarros
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-- Chapter 5 Code Examples
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--------------------------------------------------------------
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-- Listing 5-1: Using COPY for data import
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-- This is example syntax only; running it will produce an error
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COPY table_name
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FROM 'C:\YourDirectory\your_file.csv'
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WITH (FORMAT CSV, HEADER);
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-- Listing 5-2: A CREATE TABLE statement for Census county data
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-- Full data dictionary available at: http://www.census.gov/prod/cen2010/doc/pl94-171.pdf
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-- Note: Some columns have been given more descriptive names
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CREATE TABLE us_counties_2010 (
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geo_name varchar(90), -- Name of the geography
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state_us_abbreviation varchar(2), -- State/U.S. abbreviation
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summary_level varchar(3), -- Summary Level
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region smallint, -- Region
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division smallint, -- Division
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state_fips varchar(2), -- State FIPS code
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county_fips varchar(3), -- County code
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area_land bigint, -- Area (Land) in square meters
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area_water bigint, -- Area (Water) in square meters
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population_count_100_percent integer, -- Population count (100%)
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housing_unit_count_100_percent integer, -- Housing Unit count (100%)
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internal_point_lat numeric(10,7), -- Internal point (latitude)
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internal_point_lon numeric(10,7), -- Internal point (longitude)
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-- This section is referred to as P1. Race:
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p0010001 integer, -- Total population
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p0010002 integer, -- Population of one race:
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p0010003 integer, -- White Alone
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p0010004 integer, -- Black or African American alone
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p0010005 integer, -- American Indian and Alaska Native alone
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p0010006 integer, -- Asian alone
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p0010007 integer, -- Native Hawaiian and Other Pacific Islander alone
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p0010008 integer, -- Some Other Race alone
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p0010009 integer, -- Population of two or more races
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p0010010 integer, -- Population of two races:
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p0010011 integer, -- White; Black or African American
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p0010012 integer, -- White; American Indian and Alaska Native
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p0010013 integer, -- White; Asian
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p0010014 integer, -- White; Native Hawaiian and Other Pacific Islander
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p0010015 integer, -- White; Some Other Race
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p0010016 integer, -- Black or African American; American Indian and Alaska Native
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p0010017 integer, -- Black or African American; Asian
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p0010018 integer, -- Black or African American; Native Hawaiian and Other Pacific Islander
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p0010019 integer, -- Black or African American; Some Other Race
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p0010020 integer, -- American Indian and Alaska Native; Asian
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p0010021 integer, -- American Indian and Alaska Native; Native Hawaiian and Other Pacific Islander
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p0010022 integer, -- American Indian and Alaska Native; Some Other Race
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p0010023 integer, -- Asian; Native Hawaiian and Other Pacific Islander
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p0010024 integer, -- Asian; Some Other Race
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p0010025 integer, -- Native Hawaiian and Other Pacific Islander; Some Other Race
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p0010026 integer, -- Population of three races
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p0010047 integer, -- Population of four races
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p0010063 integer, -- Population of five races
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p0010070 integer, -- Population of six races
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-- This section is referred to as P2. HISPANIC OR LATINO, AND NOT HISPANIC OR LATINO BY RACE
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p0020001 integer, -- Total
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p0020002 integer, -- Hispanic or Latino
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p0020003 integer, -- Not Hispanic or Latino:
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p0020004 integer, -- Population of one race:
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p0020005 integer, -- White Alone
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p0020006 integer, -- Black or African American alone
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p0020007 integer, -- American Indian and Alaska Native alone
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p0020008 integer, -- Asian alone
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p0020009 integer, -- Native Hawaiian and Other Pacific Islander alone
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p0020010 integer, -- Some Other Race alone
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p0020011 integer, -- Two or More Races
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p0020012 integer, -- Population of two races
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p0020028 integer, -- Population of three races
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p0020049 integer, -- Population of four races
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p0020065 integer, -- Population of five races
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p0020072 integer, -- Population of six races
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-- This section is referred to as P3. RACE FOR THE POPULATION 18 YEARS AND OVER
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p0030001 integer, -- Total
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p0030002 integer, -- Population of one race:
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p0030003 integer, -- White alone
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p0030004 integer, -- Black or African American alone
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p0030005 integer, -- American Indian and Alaska Native alone
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p0030006 integer, -- Asian alone
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p0030007 integer, -- Native Hawaiian and Other Pacific Islander alone
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p0030008 integer, -- Some Other Race alone
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p0030009 integer, -- Two or More Races
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p0030010 integer, -- Population of two races
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p0030026 integer, -- Population of three races
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p0030047 integer, -- Population of four races
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p0030063 integer, -- Population of five races
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p0030070 integer, -- Population of six races
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-- This section is referred to as P4. HISPANIC OR LATINO, AND NOT HISPANIC OR LATINO BY RACE
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-- FOR THE POPULATION 18 YEARS AND OVER
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p0040001 integer, -- Total
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p0040002 integer, -- Hispanic or Latino
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p0040003 integer, -- Not Hispanic or Latino:
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p0040004 integer, -- Population of one race:
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p0040005 integer, -- White alone
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p0040006 integer, -- Black or African American alone
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p0040007 integer, -- American Indian and Alaska Native alone
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p0040008 integer, -- Asian alone
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p0040009 integer, -- Native Hawaiian and Other Pacific Islander alone
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p0040010 integer, -- Some Other Race alone
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p0040011 integer, -- Two or More Races
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p0040012 integer, -- Population of two races
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p0040028 integer, -- Population of three races
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p0040049 integer, -- Population of four races
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p0040065 integer, -- Population of five races
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p0040072 integer, -- Population of six races
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-- This section is referred to as H1. OCCUPANCY STATUS
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h0010001 integer, -- Total housing units
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h0010002 integer, -- Occupied
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h0010003 integer -- Vacant
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);
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SELECT * FROM us_counties_2010;
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-- Listing 5-3: Importing Census data using COPY
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-- Note! If you run into an import error here, be sure you downloaded the code and
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-- data for the book according to the steps listed on page xxvii in the Introduction.
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-- Windows users: Please check the Note on page xxvii as well.
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COPY us_counties_2010
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FROM 'C:\YourDirectory\us_counties_2010.csv'
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WITH (FORMAT CSV, HEADER);
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-- Checking the data
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SELECT * FROM us_counties_2010;
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SELECT geo_name, state_us_abbreviation, area_land
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FROM us_counties_2010
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ORDER BY area_land DESC
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LIMIT 3;
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SELECT geo_name, state_us_abbreviation, internal_point_lon
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FROM us_counties_2010
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ORDER BY internal_point_lon DESC
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LIMIT 5;
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-- Listing 5-4: Creating a table to track supervisor salaries
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CREATE TABLE supervisor_salaries (
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town varchar(30),
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county varchar(30),
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supervisor varchar(30),
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start_date date,
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salary money,
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benefits money
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);
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-- Listing 5-5: Importing salaries data from CSV to three table columns
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COPY supervisor_salaries (town, supervisor, salary)
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FROM 'C:\YourDirectory\supervisor_salaries.csv'
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WITH (FORMAT CSV, HEADER);
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-- Check the data
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SELECT * FROM supervisor_salaries LIMIT 2;
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-- Listing 5-6 Use a temporary table to add a default value to a column during
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-- import
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DELETE FROM supervisor_salaries;
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CREATE TEMPORARY TABLE supervisor_salaries_temp (LIKE supervisor_salaries);
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COPY supervisor_salaries_temp (town, supervisor, salary)
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FROM 'C:\YourDirectory\supervisor_salaries.csv'
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WITH (FORMAT CSV, HEADER);
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INSERT INTO supervisor_salaries (town, county, supervisor, salary)
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SELECT town, 'Some County', supervisor, salary
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FROM supervisor_salaries_temp;
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DROP TABLE supervisor_salaries_temp;
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-- Check the data
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SELECT * FROM supervisor_salaries LIMIT 2;
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-- Listing 5-7: Export an entire table with COPY
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COPY us_counties_2010
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TO 'C:\YourDirectory\us_counties_export.txt'
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WITH (FORMAT CSV, HEADER, DELIMITER '|');
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-- Listing 5-8: Exporting selected columns from a table with COPY
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COPY us_counties_2010 (geo_name, internal_point_lat, internal_point_lon)
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TO 'C:\YourDirectory\us_counties_latlon_export.txt'
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WITH (FORMAT CSV, HEADER, DELIMITER '|');
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-- Listing 5-9: Exporting query results with COPY
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COPY (
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SELECT geo_name, state_us_abbreviation
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FROM us_counties_2010
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WHERE geo_name ILIKE '%mill%'
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)
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TO 'C:\YourDirectory\us_counties_mill_export.txt'
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WITH (FORMAT CSV, HEADER, DELIMITER '|');
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