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Asked: 2026-05-15T03:26:17+00:00

i want to use alter table but the syntax posted here: http://dev.mysql.com/doc/refman/5.1/en/alter-table.html is very

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i want to use alter table

but the syntax posted here:

http://dev.mysql.com/doc/refman/5.1/en/alter-table.html

is very confusing

i do not understand what the [ ] mean or the { } mean or the pipes

is there some kind of tutorial that can help me understand this?

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1 Answer

  1. Editorial Team
    • The brackets [ ] denote optional expressions
    • The pipes mean OR.
    • The braces { } group words for the pipes.

    For example:

    • [COLUMN] means that the word COLUMN can optionally appear
    • {INDEX|KEY} means that either INDEX or KEY must appear
    • [FIRST | AFTER col_name ] means that the word FIRST or AFTER (the name of a column) can optionally appear
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