SQL PROGRAMMING STYLE- P17 pps
SQL PROGRAMMING STYLE- P17 pps
... full SQL- 92 you could write a constraint like this: CHECK (NOT EXISTS (SELECT store_nbr FROM JobAssignments WHERE job_type = 99)) GROUP BY store_nbr HAVING COUNT(*) > 1)) But many SQL ... code. Despite the SQL/ PSM and other standards, most vendors implement different trigger models and use their proprietary 4GL language, but, being a fanatic, I want a pure SQL solution....
Ngày tải lên: 06/07/2014, 23:20
SQL PROGRAMMING STYLE- P3 ppsx
... system, 89–90 Display, 96 Domain-Key Normal Form (DKNF), 62–63 DROP TABLE statement, 67 Dynamic SQL, 168–70 purpose, 168 in stored procedures, 169 E Electronic data interchange (EDI) files,
Ngày tải lên: 06/07/2014, 23:20
SQL PROGRAMMING STYLE- P20 ppsx
... particular SQL products that can suggest indexes based on the actual statements submitted to the SQL engine. Consider using one. 6.9 Avoid Correlated Subqueries Rationale: In the early days of SQL, ... is a SQL/ PSM standard, in the real world, only Mimer and IBM have implemented it at the time of this writing. Instead, each vendor has a proprietary 4GL, such as T -SQL for the Syba...
Ngày tải lên: 06/07/2014, 23:20
SQL PROGRAMMING STYLE- P24 ppsx
... and Centura (née Gupta) lets you pick which one to use—the worst of both nonstandard worlds! In SQL- 92, you have a choice and can force the order of execution. Either do the predicates after
Ngày tải lên: 06/07/2014, 23:20