https://sqlbolt.com/ 
- 브라우저에서 SQL을 직접 실행하면서 빠르게 학습 가능 
1: SELECT queries 101 
2~3: Queries with constraints 
4: Filtering and sorting Query results 
5: Simple SELECT Queries 
6: Multi-table queries with JOINs 
7: OUTER JOINs 
8: A short note on NULLs 
9: Queries with expressions 
10~11: Queries with aggregates 
12: Order of execution of a Query 
13: Inserting rows 
14: Updating rows 
15: Deleting rows 
16: Creating tables 
17: Altering tables 
18: Dropping tables 
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Afrikaans Albanian Amharic Arabic Armenian Azerbaijani Basque Belarusian Bengali Bosnian Bulgarian Catalan Cebuano Chichewa Chinese (Simplified) Chinese (Traditional) Corsican Croatian Czech Danish Dutch English Esperanto Estonian Filipino Finnish French Frisian Galician Georgian German Greek Gujarati Haitian Creole Hausa Hawaiian Hebrew Hindi Hmong Hungarian Icelandic Igbo Indonesian Irish Italian Japanese Javanese Kannada Kazakh Khmer Korean Kurdish Kyrgyz Lao Latin Latvian Lithuanian Luxembourgish Macedonian Malagasy Malay Malayalam Maltese Maori Marathi Mongolian Myanmar (Burmese) Nepali Norwegian Pashto Persian Polish Portuguese Punjabi Romanian Russian Samoan Scots Gaelic Serbian Sesotho Shona Sindhi Sinhala Slovak Slovenian Somali Spanish Sundanese Swahili Swedish Tajik Tamil Telugu Thai Turkish Ukrainian Urdu Uzbek Vietnamese Welsh Xhosa Yiddish Yoruba Zulu 
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