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DECLARE
Statement
The DECLARE
statement is used to define various items local to a
routine:
local variables (see section 18.1.6 Variables in Stored Procedures),
conditions and handlers (see section 18.1.7 Conditions and Handlers) and
cursors (see section 18.1.8 Cursors).
SIGNAL
and RESIGNAL
statements are not currently supported.
DECLARE
may only be used inside a BEGIN ... END
compound
statement and must be at its start, before any other statements.