SQL參考資料

1. (ANSI SQL 92) SQL-92 standards draft document
   http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt
   
2. SQL As Understood By SQLite
   https://sqlite.org/lang.html 
   
3. PostgreSQL: Documentation: 11: SQL Commands
   https://www.postgresql.org/docs/11/sql-commands.html 
   
4. SQL - 維基百科，自由的百科全書
   https://zh.wikipedia.org/wiki/SQL
   
5. ANSI_SQL FAQ
   https://www.tek-tips.com/faqs.cfm?fid=1073
   
6. SQL Standard - Whitemarsh is SQL Standards, Metabase Software Products and Services to achieve Enterprise Database, through Data Quality, and sound Database Design.
   https://www.wiscorp.com/SQLStandards.html 
   
7. SQLite --  Small. Fast. Reliable. Choose any three.
   https://sqlite.org/index.html 
   
8. SQLiteStudio - Free (GPL licence), advanced SQLite database manager with intuitive user interface, with no installation needed (single executable file to run).
   https://sqlitestudio.pl/index.rvt
   
9. DB Browser for SQLite -- DB Browser for SQLite (DB4S) is a high quality, visual, open source tool to create, design, and edit database files compatible with SQLite.
   https://sqlitebrowser.org/