259fd19c1b
- Now using Spring Boot for classloading, this way local development does not need to restart the complete server - Fixed all kinds of dependencies on the names of the lessons necessary to keep in mind during the creation of a lesson. - Simplied loading of resources, by adding resource mappings in MvcConfig. - Refactored plugin loading, now only one class is left for loading the lessons.
18 lines
481 B
Plaintext
18 lines
481 B
Plaintext
== What is SQL
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SQL is a way to interact with databases and is interpreted by the database.
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=== SQL - Structured Query Language
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* Not “Standard Query Language”
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* Multiple versions of SQL. Most databases have some custom functions
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* Most vendors have a proprietary extension
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=== Data Manipulation Language (DML)
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* SELECT, INSERT, UPDATE, DELETE, …
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=== Data Definition Language (DDL)
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* CREATE, ALTER, DROP,TRUNCATE,…
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=== Data Control Language (DCL)
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* GRANT, REVOKE, …
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