[Edit] SQL: DATEDIFF()

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We would like to edit the DATEDIFF() term entry under dates in SQL. The entry lives in content/sql/concepts/dates/terms/datediff/datediff.md

Please refer to the term entry template, content standards and markdown style guide when working on the PR for this issue.

Please:

• Add some more examples along with their proper explanations
• Add Best Practices and/or FAQ sections, its uses

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[yoav-es]

hello.
i would like to be assigned to this topic