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文字データ型
文字データタイプ
When converting a bit array of length n bits to a character data type, the length of the result is n characters.
Thus a character data type column updated with a string Value is always held in the database with an upper-case V and the remainder of the letters lowercase.
このため、文字列 Value で更新した文字データ型カラムは、常に大文字の V と残りの文字が小文字でデータベースに格納されます。
Data Type Fields-Change default data types for column fields to match data types of the database server. If the DBMS and middle ware support a large binary data type, use it for VarData columns. If not, use the largest character data type.
Uses a soundex algorithm based on permitted domain values to find a value that is similar to the error record. If no soundex value is found, the original value is used. This option is available for Domain List rules with character data type only.
In this Topic: Date/Time Data Types for Columns Referential Integrity Constraints When to Set a Clustering Key When to Specify Column Lengths Storing Semi-structured Data in a VARIANT Column vs. Flattening the Nested Structure Converting a Permanent Table to a Transient Table or Vice-Versa Date/Time Data Types for Columns When defining columns to contain dates or timestamps, we recommend choosing a date or timestamp data type rather than a character data type.
The typeless nature of B made sense on the Honeywell, PDP-7 and many older computers, but was a problem on the PDP-11 because it was difficult to elegantly access the character data type that the PDP-11 and most modern computers fully support.
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