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Is it possible to conditionally select columns in MySQL?

In MySQL, will a SELECT from an indexed column alway result in sorted outputl?

  • If I issue a SELECT in mysql like: SELECT c1 FROM t1; and if c1 is indexed using a B-Tree index, then will my output essentially be equivalent to: SELECT c1 FROM t1 ORDER BY c1; Are there conditions for this to happen?

  • Answer:

    If mysql has truly implemented SQL, the answer should be no. In SQL, the purpose of an index is to speedup the where clause providing that its expression can be logically speeded up using the index and to speedup the sorting as specified by the order by clause.

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i think it will return sorted value couse query read data from first index of table.

akira

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