Oracle's If Else if

There was a problem writing the Oracle stored procedure a while ago.
Originally written like this
If 1=2 Then
Null
ElseIf 1=3 Then
Null
End If;
The ElseIf does not change color in the PL/SQL editing environment, stating that it is not a keyword.
Later changed into
If 1=2 Then
Null
else if 1=3 then
Null
End If;
Compile times exception.
To Goole on Baidu, a lot of people are said to be ElseIf.
Try the n side again, the compilation will not pass.
Angry, directly written
If 1=2 Then
Null
else if 1=3 then
Null
End If;
End If;
The problem is solved.

Today again in the stored procedure with If...else if ... else if ... Writing data conversion of the east, but also according to the original writing looked very disgusting.
Later found to be written if...elsif...elsif....end if;
God, I finally found the answer.

Return to see, originally not ElseIf, but elsif, less an "E". His uncle's, why do you want less e Ah, the evil Oracle, really disgusting.

No matter what, the problem has finally been solved, the nausea in mind, do not make the same mistakes in the future.

A search on the internet, a group of people are still making mistakes ...

Oracle's If Else if