updating by insertionsyntaxinsert into
Updating by insertion
Syntax:
INSERT INTO ENROLMENT
VALUES (SID ('S4'),
'Devinder',
CID ('C1'));
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authorisations - privilegesas relational theory is silent on the issue of authorisation it offers nothing with which sqls vast edifice in support of
updating variablesfor assignment sql uses the key word set as in set x x 1 read as set x equal to x1 rather than x x 1 as found in many computer
updating by deletiondelete from enrolment where studentid sid s4as you can see this differs from example by the addition of the noise word from the
updating by replacementsyntaxupdate enrolment set name annwhere studentid sid s1note the use of set as already noted in connection with direct
updating by insertionsyntaxinsert into enrolmentvalues sid s4devindercid
sqls fifth concept - null unfortunately sql embraces a fifth concept called null an apparently simple little thing but one that has pervasive effects
effects of nullthe numeric variable x perhaps of type integer might be assigned null in that case the result of evaluating x 1 is null and so set y
important distinctionsthe list of important distinctions are given below value versus variable syntax versus semantics variable versus variable
read-only operator - sqlthe term read-only operator to the mathematical term function here i just need to add that the sql standard reserves the
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