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can be defined (my italics): Well, I strongly suspect that CREATE TABLE and ALTER TABLE are the only vehicles for defining such constraints, but that s not what can be defined suggests especially given the first half of the sentence ( They are optional ); for otherwise, why are the two halves of the sentence joined by and into a single thought anyway Important question: If I try to add a new constraint via ALTER TABLE, what happens if existing rows in the relevant base table already violate the new constraint (I believe I know the answer to this question That s not the point What is the point is that I would have expected the answer to be provided in the documentation right here, but it isn t) 3 The specification of table check constraints is a restricted form of a search condition.

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First of all, if this sentence doesn t actually confuse singular and plural again, it certainly comes pretty close to doing so But there are more serious objections to it The specification is .. a search condition : Here the writer is using specification, very confusingly, to refer not to what the user actually has to specify when writing a base table check constraint, but rather to a proper subset of what the user has to specify: namely, that subset of the specification that appears within parentheses in the CHECK clause.

Summary

(And that CHECK clause in turn is still only a subset of the specification of the overall base table check constraint!) Thus, I would have said rather more precisely, and more explicitly that a base table check constraint consists of an optional CONSTRAINT clause and a mandatory CHECK clause; the optional CONSTRAINT clause provides a name for the constraint (if omitted, then the constraint is unnamed), and the mandatory CHECK clause includes a search condition that rows of the base table in question are required to satisfy The specification is .. a restricted form of a search condition : First, a search condition should be just search condition ; a search condition emphasis added suggests (to this reader, at least) one specific search condition (and then I want to ask, which one ).

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