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[sql / en] Fix Ambiguous ISO

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- [ ] I solemnly swear that this is all original content of which I am the original author
- [ ] Pull request title is prepended with `[language/lang-code]`
- [ ] Pull request touches only one file (or a set of logically related files with similar changes made)
- [ ] Content changes are aimed at *intermediate to experienced programmers* (this is a poor format for explaining fundamental programming concepts)
- [ ] If you've changed any part of the YAML Frontmatter, make sure it is formatted according to [CONTRIBUTING.md](https://github.com/adambard/learnxinyminutes-docs/blob/master/CONTRIBUTING.markdown)
  - [ ] Yes, I have double-checked quotes and field names!
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@ -5,7 +5,7 @@ contributors:
- ["Bob DuCharme", "http://bobdc.com/"]
---
Structured Query Language (SQL) is an ISO standard language for creating and working with databases stored in a set of tables. Implementations usually add their own extensions to the language; [Comparison of different SQL implementations](http://troels.arvin.dk/db/rdbms/) is a good reference on product differences.
Structured Query Language (SQL) is an [ISO/IEC 9075](https://www.iso.org/standard/53686.html) standard language for creating and working with databases stored in a set of tables. Implementations usually add their own extensions to the language; [Comparison of different SQL implementations](http://troels.arvin.dk/db/rdbms/) is a good reference on product differences.
Implementations typically provide a command line prompt where you can enter the commands shown here interactively, and they also offer a way to execute a series of these commands stored in a script file. (Showing that you’re done with the interactive prompt is a good example of something that isn’t standardized--most SQL implementations support the keywords QUIT, EXIT, or both.)