deklarieren Sie Variablen SQL
-- name type value
DECLARE @PersonId AS UNIQUEIDENTIFIER = 'ddb7bfff-9ce8-4651-6973-08d9a46c90b6'
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-- name type value
DECLARE @PersonId AS UNIQUEIDENTIFIER = 'ddb7bfff-9ce8-4651-6973-08d9a46c90b6'DECLARE @datecurrent datetime2
set @datecurrent = CAST(getdate() AS smalldatetime)how to declare a variable in sql