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29 lines
955 B
Markdown
29 lines
955 B
Markdown
# CIS105: Computer Applications & Information Systems Lect. 12
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## Chapter 12: Introduction to SQL
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### 12.1: SQL Getting Started
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- Capture the data
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- Point of Sale, Scanning, etc
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- Get the data into a database
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- Import from other systems
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- Direct input from forms
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- Extract the data
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- SQL
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- Use the data
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- Analysis systems
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- Reporting systems
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- SQL: The language of relational databases
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- Structured query Language
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If you plan to analyze data for a business, there is a good chance it's stored in a data warehouse, and you will need to learn how to retrieve it yourself.
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### 12.2: SQL Statement
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- `SELECT`: What **fields** (column) you want
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- `fieldname`: If the name is used in only one table
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- `FROM`: What table or tables contain the fields
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- `ORDER BY`: Sorting
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- `DISTINCT`: Use after `SELECT` when you only want to show each vale of the selected field(s) once
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- `LIMIT`: Use when you want to limit the number of records produced |