DETERMINISTIC Functions (203)
Any user-written function used in a function-based index
must have been declared with the DETERMINISTIC keyword to indicate that the
function will always return the same output return value for any given set of input
argument values, now and in the future.
DETERMINISTIC函式
函式索引使用的使用者自定義函式必須宣告為 DETERMINISTIC,此關鍵字表明對於不一定的輸入引數,
此函式總會得到相同的輸出結果返回值。
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