[JS] Simple way to measure execution time

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This sample shows count execution time for a function.

[SQL] Duplicate entry of Primary Index

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If you see Duplicate entry of Primary Index (Primary Key) Error Then most of case might be an user clicked request multiple times or query executed multiple ...

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Baisc boolean logic sample.

[Python] Set

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Simple example of set in Python

[Python] If Statement

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```python x = 28;