108 lines
2.1 KiB
MySQL
108 lines
2.1 KiB
MySQL
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--
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-- Set up a many-to-many relationship between tables hosts and eps
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-- -----------------------------------------------------------------------------
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--
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--
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-- Make a table called 'new_hosts' containing a copy of the hosts table
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-- with the same structure but no data. Shrink the hostid column to int(5).
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--
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DROP TABLE IF EXISTS new_hosts;
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CREATE TABLE IF NOT EXISTS new_hosts (
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hostid int(5) NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (hostid)
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) ENGINE=InnoDB
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SELECT * FROM hosts WHERE 0 = 1;
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-- without the "double host" entries (host='Host1 and Host2')
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-- SELECT * FROM hosts where host NOT LIKE '% and %';
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SHOW warnings;
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--
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-- Make a table called 'new_eps' containing a copy of the eps table without
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-- the host-related columns but no data.
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--
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DROP TABLE IF EXISTS new_eps;
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CREATE TABLE IF NOT EXISTS new_eps (
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id int(5) NOT NULL,
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PRIMARY KEY (id)
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) ENGINE=InnoDB
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SELECT
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id,
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date,
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title,
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summary,
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notes,
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series,
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explicit,
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license,
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tags,
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version,
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valid
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FROM eps WHERE 0 = 1;
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SHOW warnings;
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--
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-- Table structure for the mapping table 'hosts_eps'
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--
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DROP TABLE IF EXISTS hosts_eps;
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CREATE TABLE IF NOT EXISTS hosts_eps (
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host_id int(5) NOT NULL
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REFERENCES new_hosts(hostid),
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eps_id int(5) NOT NULL
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REFERENCES new_eps(id),
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PRIMARY KEY hosts_eps_pk (host_id,eps_id)
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) ENGINE=InnoDB;
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SHOW warnings;
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--
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-- Populate the hosts_eps table
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--
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/*
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INSERT INTO hosts_eps (host_id, eps_id)
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SELECT ho.hostid, eps.id
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FROM hosts ho
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JOIN eps ON ho.hostid = eps.hostid
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ORDER BY ho.hostid, eps.id;
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SHOW warnings;
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*/
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--
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-- Make a view to simplify access to new_hosts and new_eps
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--
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DROP VIEW IF EXISTS hosts_with_eps;
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CREATE VIEW hosts_with_eps AS
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SELECT
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nh.hostid,
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nh.host,
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nh.email,
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nh.profile,
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nh.license AS host_license,
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nh.local_image,
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nh.valid AS host_valid,
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ne.id,
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ne.date,
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ne.title,
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ne.summary,
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ne.notes,
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ne.series,
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ne.explicit,
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ne.license AS eps_license,
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ne.tags,
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ne.version,
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ne.valid AS eps_valid
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FROM new_hosts nh
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JOIN hosts_eps he ON (nh.hostid = he.host_id)
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JOIN new_eps ne ON (he.eps_id = ne.id)
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ORDER BY nh.hostid, ne.id;
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SHOW warnings;
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/*
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vim: syntax=sql ai tw=75:
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*/
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