|
(Gast)
n/a Beiträge
|
AW: Index wird teilweise nicht benutzt
10. Aug 2016, 12:36
Zitat:
By default, relational databases ignore NULL values (because the relational model says that NULL means "not present"). So, Index does not store NULL value, consequently if you have null condition in SQL statement, related index is ignored (by default).  http://stackoverflow.com/questions/9...ullable-column
|
|
|
Zitat
|