BOOK_PARENT_CHILD

The BOOK_PARENT_CHILD table contains the parent/child relationships used to build the book hierarchy.

Unique Key

Joins

There is a self-join on the BOOK_PARENT_CHILD table - see database creation script for details.

Table creation script

Snowflake

Table creation

create OR REPLACE table BOOK_PARENT_CHILD(
	AS_OF_DATE DATE NOT NULL,
	CHILD STRING,
	PARENT STRING,
	DESK STRING,
	CATEGORY STRING,
    primary key (AS_OF_DATE, CHILD)
);

The content of this table is used to populate the table BOOK_HIERARCHY table; see the script here.

Table population from files (optional)

If you want to populate the table from CSV files, you can run the following scripts (this example assumes that you want to load the files BookParentChild.csv present in the folders 2023-09-25, 2023-09-26, 2023-09-27 and 2023-09-28):

create OR REPLACE stage MR_INPUT_RAW;
create OR REPLACE file format CSV_GZIP
TYPE = CSV
COMPRESSION = GZIP
SKIP_HEADER = 1
comment = 'File format to import MR data';
create OR REPLACE file format CSV_FORMAT
TYPE = CSV
COMPRESSION = AUTO
SKIP_HEADER = 1
comment = 'File format to import MR data';
PUT file://<full path to you data folder>/2023-09-25/BookParentChild.csv @MR_INPUT_RAW/2023-09-25;
PUT file://<full path to you data folder>/2023-09-26/BookParentChild.csv @MR_INPUT_RAW/2023-09-26;
PUT file://<full path to you data folder>/2023-09-27/BookParentChild.csv @MR_INPUT_RAW/2023-09-27;
PUT file://<full path to you data folder>/2023-09-28/BookParentChild.csv @MR_INPUT_RAW/2023-09-28;
copy into BOOK_PARENT_CHILD from @MR_INPUT_RAW pattern='./BookParentChild..csv.gz' FILE_FORMAT = CSV_GZIP;