Difference: 1. as can be used in the view VIEW, but is cannot be used in the view VIEW; 2. as cannot be used in the cursor CURSOR, but is can be used in the cursor CURSOR.
The operating environment of this tutorial: Windows 10 system, Oracle 11g version, Dell G3 computer.
There is no difference between stored procedures (PROCEDURE) and functions (FUNCTION);
Only in views (VIEW) Use AS but not IS;
can only use IS but not AS in the cursor (CURSOR).
Summary: To make it easy to remember, use is for cursors and as for everything else
Recommended tutorial: "Oracle Tutorial"
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