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Yesterday, April 19, 2017, you asked what T-SQL was.
Here’s a shortened version of Wikipedia’s T-SQL entry header-
“Transact-SQL…is Microsoft’s and Sybase’s proprietary extension to…SQL…[and] interact[s] with relational databases.
T-SQL expands on the SQL standard to include procedural programming, local variables, various support functions for string processing, date processing, mathematics, etc…
Transact-SQL is central to using Microsoft SQL Server.”