Web Reference: May 1, 2014 · Strong ref_cursor will always use to return a value and compiler know the structure during the compile time, but in the weak ref cursor it will not return a value and compiler dosen't know the structure during the compile time. PL/SQL supports two kinds of REF CURSOR types: Strong typed reference cursor ties to a specific query structure. Weak typed referencce cursor can point to any query. For example, the following shows how to define a strong REF CURSOR: DECLARE TYPE customer_t IS REF CURSOR RETURN customers %ROWTYPE; If the cursor variable is strong, PL/SQL catches incompatibility at compile time. If the cursor variable is weak, PL/SQL catches incompatibility at run time, raising the predefined exception ROWTYPE_MISMATCH before the first fetch.
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