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ALTER TABLE
===========
An ALTER statement modifies the definition (structure) of a table inside Drizzle.
The types of objects that can be altered depends on which RDBMS is being used.
The ALTER TABLE statement is used to change a table definition by:
1) Adding, dropping, modifying table columns
2) Adding and dropping constraints
3) Enabling and Disabling constraints
4) Rename a table
.. todo::
add something about current implementation: i.e. write blocking copying alter table.
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