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SQL Server で NVARCHAR / VARCHAR の長さを省略するとどうなるかを解説しています。 ・CAST / CONVERT で NVARCHAR とだけ書いた場合 → 自動的に NVARCHAR(30) として扱われ、31文字目以降は切り捨てられます。 ・変数宣言で DECLARE @name NVARCHAR; のように書いた場合 → 自動的に ...
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