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Oracle AS keyword and subqueries

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星月不相逢
星月不相逢 2020-12-19 21:02

Just found out that Oracle does not like it when you use the AS keyword to alias a subquery:

SELECT * FROM (SELECT * FROM products) AS p
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  • 轻奢々
    轻奢々 (楼主)
    2020-12-19 21:52

    The pattern for the SQL 99 ANSI is that the table can have an alias WITHOUT the AS keyword so, you can take out AS and it should work on every RDBMS. See it on fiddle:

    • MySQL
    • Oracle
    • PostgreSql
    • SQLLite
    • SQLServer

    In ISO/IEC 9075-2:1999, section 7.6

    , page 232:

    ::=
    |
    ::=
    [ [ AS ] [ ] ] | [ AS ] [ ] | [ AS ] [ ] | [ AS ] [ ] | [ [ AS ] [ ] ] |

    Also confirmed to work:

    • MS Access (Jet)

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