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2. Set operations (SQL) - Wikipedia

   en.wikipedia.org/wiki/Set_operations_(SQL)

   Set operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. [1] Set operators in SQL include UNION, INTERSECT, and EXCEPT, which mathematically correspond to the concepts of union, intersection and set difference.

3. Hash table - Wikipedia

   en.wikipedia.org/wiki/Hash_table

   On the other hand, if infinite time is available, values can be stored without regard for their keys, and a binary search or linear search can be used to retrieve the element. [ 7 ] : 458 In many situations, hash tables turn out to be on average more efficient than search trees or any other table lookup structure.

4. Transact-SQL - Wikipedia

   en.wikipedia.org/wiki/Transact-SQL

   Transact-SQL is central to using Microsoft SQL Server. All applications that communicate with an instance of SQL Server do so by sending Transact-SQL statements to the server, regardless of the user interface of the application. Stored procedures in SQL Server are executable server-side routines. The advantage of stored procedures is the ...

5. Extreme programming practices - Wikipedia

   en.wikipedia.org/wiki/Extreme_Programming_Practices

   The pairs are not fixed; programmers switch partners frequently, so that everyone knows what everyone is doing, and everybody remains familiar with the whole system, even the parts outside their skill set. This way, pair programming also can enhance team-wide communication. (This also goes hand-in-hand with the concept of Collective Ownership).

6. Row- and column-major order - Wikipedia

   en.wikipedia.org/wiki/Row-_and_column-major_order

   Note how the use of A[i][j] with multi-step indexing as in C, as opposed to a neutral notation like A(i,j) as in Fortran, almost inevitably implies row-major order for syntactic reasons, so to speak, because it can be rewritten as (A[i])[j], and the A[i] row part can even be assigned to an intermediate variable that is then indexed in a separate expression.

7. mSQL - Wikipedia

   en.wikipedia.org/wiki/MSQL

   Hughes therefore developed a translation program which provided an SQL interface to the free Postgres DBMS (which did not use SQL [3]). This product was named miniSQL, [clarification needed] or mSQL. In time it became clear that Postgres did not perform adequately on the low-specification systems used to run Minerva, so mSQL developed into a ...