常見例句You must set at least one value. 必須至少設(shè)置一個(gè)值。Use to subtract one value from another. 用于將一個(gè)值減去另一個(gè)值。Here, get two of each value and loop to extract only one value. 這兒,得到兩個(gè)值中的每一個(gè),并且循環(huán)提取一個(gè)值。A subquery in a comparison test must return exactly one value. 比較測試中的子查詢必須恰好返回一個(gè)值。Often, you may wish to return more than one value at a go. 通常,您可能希望一次返回多個(gè)值。At least one value in the foreign key column is NULL. 外鍵列中至少有一個(gè)值為NULL。 返回 one-valued