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If one of conditions a) to t) applies to the format of the cursor declaration, the cursor is read-only. If none of the
conditions applies, the cursor is updatable.
Conditions a) to p) are specified in query specifications. Condition q) is specified in query expressions. Conditions r) to
t) are specified in cursor declarations. Conditions r) and s) support updatable cursors only if FOR UPDATE is specified
in the updatable clause. For more information on the subquery in condition p), see 6.2 "Specifying Various Search
Conditions". For more information on UNION in condition q), see 5.5 "Obtaining the Aggregate for Rows from Multiple
Tables".
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