37 lines
869 B
MySQL
37 lines
869 B
MySQL
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USE tutorial;
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/* Cartesian product (every row combined with every other row) and filter out rows */
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SELECT
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em.id AS 'Employee ID',
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em.surname AS 'Surname',
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em.forename AS 'forename',
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at.id AS 'Title ID',
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at.name AS 'Title'
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FROM
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Employee AS em,
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AcademicTitle AS at
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WHERE
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em.surname LIKE 'Ma%'
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AND at.id = em.academicTitleId;
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/* only select rows which have a matching (true) condition */
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SELECT *
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FROM Employee AS em
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INNER JOIN AcademicTitle AS at
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ON em.academicTitleId = at.id
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WHERE
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em.surname LIKE 'Ma%';
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SELECT
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em.surname,
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em.roomId AS 'Employee Room',
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room.id AS 'Room ID',
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room.name AS 'Room name'
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FROM Employee as em
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INNER JOIN Room as room ON em.roomId = room.id
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WHERE room.name LIKE 'a%';
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SELECT
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count(*) AS Anzahl
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FROM Employee em
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LEFT JOIN PostalLocation post ON post.id = em.postalLocationId;
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