From 98626190c56e6af18390703a00a3f655db00f486 Mon Sep 17 00:00:00 2001 From: Nick Leeman Date: Mon, 25 Oct 2021 14:51:26 +0200 Subject: [PATCH] Vault sync: 2021-10-25 14:51:26 --- School/Development/SELECT.md | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/School/Development/SELECT.md b/School/Development/SELECT.md index 5d8634d..089718d 100644 --- a/School/Development/SELECT.md +++ b/School/Development/SELECT.md @@ -1 +1,15 @@ -# SQL \ No newline at end of file +# SQL Database +- Database is a collection of related data. +- Data is: known facts that can be recorded and have implicit meaning. +- Database is a collection of values in digital form, organized in a efficient way + +## Data modeling + +Data model is a collection of concepts to describe the structure of a database. + +Structure of a database includes data types, relationships and constraints that apply to the data. + +- High Level: Conceptual data models +- Low Level: Physical data models +- Representational: implementational data models +