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You have to think about the data, you model. Think about a customer: You need some informations, to make a deal, name, address, a unique id ... - some data is optional: mobile phone, for instance. All, what is necessary, should be NOT NULL. We can't tell much more.

user unknown
– user unknown

2011-03-17 05:45:15 +00:00
Commented Mar 17, 2011 at 5:45

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Correct minor typos or mistakes
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

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