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
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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
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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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