I am interviewing for a PL/SQL position with a large corporation. I will have to write a multiple choice exam. I am wondering whether the exam will likely use old-style joins (joining happens in the 'WHERE' clause) or ANSI ones. My apologies if this is not the correct forum for this question.
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Show them you know both styles.
I can tell you by experience that PL/SQL programmers prefer the Oracle-style joins.
I have maintained PL/SQL solution and hardly ever seen an ANSI-join.
Left and right joins and more terse because of the (+) especial Oracle keyword.
Been said that, ANSI-joins are more universal and make it easier to migrate between different RDBMS.
It's probable that your interviewer, if he/she is an Oracle lifelong programmer, is unfamiliar with the ANSI-style.
I tend to think that if you are looking for an PL/SQL position, do things the Oracle way. That's what they would expect.