Samenvatting colleges databases 2. Behandelde onderwerpen zijn: algemene SQL syntaxis, MySQL algemeen, indices, joins, transacties, functies, procedures, views, triggers, ACID, isolation levels, concurrency, MVCC.
Afbeeldingen gebruikt in het document zijn niet van mij.
It does indicate what certain functions do, but it does not say how to use them.
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Samenvatting databases 2
Collegesheets
Pascal Cokart
Juni 2018
Versie 1.5
,Inhoud
College 1.................................................................................................................................................4
Surrogate key (surrogaatsleutel)........................................................................................................4
Waarom surrogaatsleutel gebruiken..................................................................................................4
Auto increment...................................................................................................................................4
College 2.................................................................................................................................................5
Algemeen SQL....................................................................................................................................5
SQL onderdelen..................................................................................................................................5
MySQL datatypen...............................................................................................................................5
CHAR...................................................................................................................................................6
INTEGER..............................................................................................................................................6
BOOLEAN en ENUM............................................................................................................................6
Kiezen van datatypen.........................................................................................................................6
Data integriteit...................................................................................................................................6
Primaire sleutel en unieke sleutels.....................................................................................................6
SQL DDL (Data Defniion Language)...................................................................................................7
Access control.....................................................................................................................................7
Rechten niveaus binnen een database...............................................................................................7
Rechten binnen een tabel...................................................................................................................7
College 3.................................................................................................................................................8
Volgorde SELECT statement:..............................................................................................................8
Funcies..............................................................................................................................................8
WHERE clause.....................................................................................................................................8
HAVING...............................................................................................................................................9
Geaggregeerde funcies:....................................................................................................................9
GROUP BY...........................................................................................................................................9
Storage engines..................................................................................................................................9
Joins....................................................................................................................................................9
Soorten joins.....................................................................................................................................10
Syntax joins.......................................................................................................................................10
Syntax ON.....................................................................................................................................10
Syntax USING................................................................................................................................10
Syntax NATURAL JOIN...................................................................................................................10
Syntax WHERE..............................................................................................................................10
Subquerys.........................................................................................................................................10
1
, User variables...................................................................................................................................11
College 4...............................................................................................................................................12
Indices..............................................................................................................................................12
Gebruik indices in MySQL.................................................................................................................12
Views................................................................................................................................................12
Waarom views..................................................................................................................................12
Updatable views...............................................................................................................................12
Beperkingen van views.....................................................................................................................13
Stored procedures en funcies..........................................................................................................13
Waarom stored procedures of funcies............................................................................................13
Procedureel SQL...............................................................................................................................14
Variabelen in funciessprocedures...................................................................................................14
Syntax procedures en funcies..........................................................................................................14
Syntax procedure..........................................................................................................................14
Syntax funcie...............................................................................................................................14
Voorbeeld funcie.........................................................................................................................15
DELIMITER........................................................................................................................................15
RETURN............................................................................................................................................15
Comments........................................................................................................................................15
View vs funcion...............................................................................................................................15
Triggers.............................................................................................................................................15
Waarom triggers...............................................................................................................................16
Beperkingen.....................................................................................................................................16
Syntax trigger....................................................................................................................................16
Syntax trigger:...............................................................................................................................16
College 5...............................................................................................................................................17
Database transacions......................................................................................................................17
Waarom transacies.........................................................................................................................17
ACID (Atomacity Concistency Isolaion Durability)...........................................................................17
Concurrency problems:....................................................................................................................18
Klassieke concurrency problemen....................................................................................................18
Isolaion levels..................................................................................................................................19
Concurrency control strategies.........................................................................................................20
Locking..............................................................................................................................................20
Locks gebruiken............................................................................................................................21
Niveau van vergrendeling (granularity of locking)............................................................................21
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