- A flag associated with an alternate key that indicates whether or not a null key value is defined for the key. For binary, integer, and packed decimal key data types, the null key value is zero expressed in that data type. For the string key data type, users must specify a byte value from 000(8) through 377(8) including ASCII codes.; 和某個(gè)替換關(guān)鍵字相聯(lián)系的標(biāo)志,用于指示是否為該關(guān)鍵字定義了一個(gè)空關(guān) 鍵字值。對(duì)于二進(jìn)制數(shù)、整數(shù)和壓縮十進(jìn)制關(guān)鍵字?jǐn)?shù)據(jù)類型,空關(guān)鍵字值為零,并表示為該 數(shù)據(jù)類型的形式。對(duì)于字符串關(guān)鍵字?jǐn)?shù)據(jù)類型,用戶必須指定一個(gè)字節(jié)的數(shù)值,從八進(jìn)制的 000到377,其中包括了ASCII字符的代碼。
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