Andrew Gierth wrote: > SQL2016, 15.17 Execution of referential actions > > 10) If a non-null value of a referenced column RC in the referenced > table is updated to a value that is distinct from the current value > of RC, then, > > [snip all the stuff about how ON UPDATE actions work] > > does that "is distinct from" mean that IS DISTINCT FROM would be true, > or does it mean "is in some way distinguishable from"? Nothing I can see > in the spec suggests the latter.
My 2003 standard defines, and even condescends to be informal: 3.1.6.8 distinct (of a pair of comparable values): Capable of being distinguished within a given context. Informally, not equal, not both null. A null value and a non-null value are distinct. Yours, Laurenz Albe
