updating a variableassignment of an attribute
Updating a Variable
Assignment of an attribute value in a variable of a structured type
Synatx:
SET SN.C = 'S2';
As in Example the entire statement is equivalent to a regular assignment, in this case
SET SN = SID ().C ('S2');
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effect of anonymous columnsnow recall that a values expression denotes a table with undefined column names if an initial value is to be specified
adding table constraints alter table enrolment add constraint namenotnullcheck name is not null alter table enrolment add constraint
assignment of variable - updating a variablesyntaxset sn sid s2this can obviously be read as set the variable sn to be equal in value to sid s2
assignment source not a literal - variablesyntaxset sn sid substring snc from 1 for
updating a variableassignment of an attribute value in a variable of a structured typesynatxset snc s2as in example the entire statement is
predicate - sqlconsider the declarative sentence-a proposition-that is used to introduce this topic student s1 named anne is enrolled on course
substitution and instantiation - sqlit shows how null might appear in substitution for a parameter of a predicate and how it might thus participate
table represents an extension - sqlit describes how each tuple in a relation represents a true instantiation of some predicate and each true
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