null

美 [n?l] 　英 [n?l]

• adj.沒有價(jià)值的；無用的；【法】無法律效力的；【科技】沒有
• n.【數(shù)】數(shù)字零；【計(jì)】空位；空白符號；【電子】無信號
• v.抵消；〈罕〉【法】宣布無效；〈罕〉徹底消滅
• 網(wǎng)絡(luò)空值；空字符；空指針

詞形變化

反義詞

同義詞

英漢雙解

習(xí)慣用語

英漢解釋

英英解釋

例句

This tip addresses one of those cases: the distinction between an array which is null, and an array which has no elements.

這里介紹的技巧用于處理其中的一個情況：一個為“零”的數(shù)組和一個沒有元素的數(shù)組之間的差別。

NULL constants cannot be inserted into a timestamp column through a distributed query.

無法通過分布式查詢將NULL常量插入timestamp列中。

This certificate shall be considered null and void in case of any alteration.

任何修改，本證書將被視為無效。

In todo_foreign, that would require two columns; the deletion date might be null to indicate that the item is still active.

在todo_foreign中，這將需要兩個列；刪除日期可能為null，表示該事項(xiàng)仍然在活動中。

For a calculation of the exact benefits of NULL and system default compression, it would be necessary to count these values per column.

若要精確計(jì)算NULL壓縮和系統(tǒng)默認(rèn)值壓縮所節(jié)省的空間，則需要逐列地計(jì)算這些值的數(shù)量。

In China, where the deprivation of a minor violation of the law and unable to work the right to inherit part of the heirs, null and void.

在中國，凡違背法律規(guī)定剝奪未成年人和無勞動能力的繼承人的繼承權(quán)的部分，歸于無效。

To declare a variable and initialize it without assigning it a particular value, assign it the JScript value null.

若要在不分配特定值的情況下聲明一個變量并對其進(jìn)行初始化，請為其分配JScript值null。

The results do not make it easy to distinguish a NULL in the data from a NULL that represents a failure to join.

從結(jié)果中很難區(qū)分數(shù)據(jù)中的NULL值和表示聯(lián)接失敗的NULL值。

Attribute value with a null reference assigned to a reference type or to a nullable value type.

屬性值等同于分配給引用類型或分配給可為空值類型的空引用。

The constructor function has no parameters and returns an instance of the type with all of its attributes set to null values.

構(gòu)造函數(shù)沒有參數(shù)，并且返回的類型實(shí)例中的所有屬性都為空。

Experimenters have yet to see such a frame, but the null result may simply be for want of sufficient precision.

實(shí)驗(yàn)學(xué)家目前還沒看到這樣的座標(biāo)，不過看不出跡象并不代表沒有，也許只是缺乏足夠的精確度使然。

Columns of a unique index are allowed to be NULL, while columns in a unique constraint are not.

唯一索引的列可以為NULL，而唯一約束的列不能為NULL。

It used to be that the goal in econometric work was to get results that were statistically significant, to reject the null hypothesis.

過去，搞經(jīng)濟(jì)計(jì)量學(xué)時，目標(biāo)往往是爭取讓獲得的結(jié)果，在統(tǒng)計(jì)上有顯著意義，這樣就能拒絕零假設(shè)。

Consequently, any information on the investigation that comes from another source is null and void if it has not been validated by the BEA.

因此，從其他來源的任何調(diào)查的信息是無效的，如果它沒有被驗(yàn)證了BEA。

This routine initially checks if the passed inquiry context is not NULL and if it a context for group member.

它首先檢查傳遞的查詢上下文是否非NULL，以及是否是組成員的上下文。

For this reason, a scene which has no formal links always has at least one link in it, though this link has a ref value of "null" .

因此，沒有正式鏈接的場面也要包含至少一個鏈接，這個鏈接的ref值是“null”。

Remember, in C, a string is nothing but an array of characters with a terminating NULL character (ASCII 0).

請記住，在C語言中，字符串只是一個帶有終止NULL字符（ASCII0）的字符數(shù)組。

The goal with validation is to avoid some simple errors, such as trying to put a NULL into a field that doesn't accept them.

驗(yàn)證的目標(biāo)就是要避免一些簡單錯誤，例如嘗試將NULL放入不接受這種值的字段。

Though you did not specify that column, the Rails migration created it for you anyway, with auto_increment and NOT NULL.

雖然沒有指定這個列，但是Rails遷移會自動創(chuàng)建它，并具有auto_increment和NOTNULL屬性。

A value of NULL is not considered to be greater than, less than, or equivalent to any other value, including another value of NULL.

NULL值不視為大于、小于或等于任何其他值，包括另一個NULL值。

The zero or null matrix denoted by 0 is definde as a matrix all of whose elements are zero.

如果一個矩陣的所有元素都為零，則稱它為零矩陣。

Exclude columns: The name of the columns that you want to be excluded can be null.

排除列：您希望被排除的列名稱可以為空。

At least one of the null values must be a typed NULL.

至少應(yīng)有一個空值為NULL類型。

The property acquired as a result of a contract shall be returned after the contract is confirmed to be null and void or has been revoked.

合同無效或者被撤銷后，因該合同取得的財(cái)產(chǎn)，應(yīng)當(dāng)予以返還。

The SUM function returns the total sum of a column in a given selection. NULL values are not included in the calculation.

使用SUM函數(shù)可以返回給定的選擇中列的所有記錄值的累計(jì)合。NULL值不包括在內(nèi)。

The argument that is set to null could have been used to transmit additional properties to the dynamic page instance.

設(shè)置為null的參數(shù)可用于將附加屬性傳送到動態(tài)頁面實(shí)例。

The following table illustrates the relationship between the existence of a default and the definition of a column as NULL or NOT NULL.

下表說明默認(rèn)值的存在與將列定義為NULL或NOTNULL之間的關(guān)系。

When you work with strings with a null value, the result of the concatenation depends on the session settings.

處理具有空值的字符串時，串聯(lián)結(jié)果取決于會話設(shè)置。

The following example adds a column that allows null values and has no values provided through a DEFAULT definition.

以下示例將添加一個允許空值的列，而且沒有通過DEFAULT定義提供的值。

Since the requirement is to only suppress nulls, the visual null suppression can be replaced by the Null suppression on the actual query.

因?yàn)?/c>需求是僅抑制nulls，可視的nullsuppression可由實(shí)際查詢上的Nullsuppression替換。

If you were using an Object-based stack, you would simply return null, but a generic stack could be used with value types as well.

如果您使用基于Object的堆棧，則可以簡單地返回null，但是您還可以通過值類型來使用一般堆棧。

When null, the data point takes up no space just as if the column didn't exist.

當(dāng)值為null時，數(shù)據(jù)指針就完全不占用空間，就像這個列不存在一樣。

We have examined the occurrence of GSTM1 null, one of the glutathione S-transferase mu genes, in a control and a Parkinson's disease group.

我們審核了發(fā)生GSTM1空白，其中谷胱甘肽S-轉(zhuǎn)移酶基因畝，在控制和治療帕金森病組。

In a Java environment, if an object is null, trying to manipulate it causes an error.

在一個Java環(huán)境中，如果一個對象為空，試圖操作它將導(dǎo)致錯誤。

If it slackened while expanding, its strength would be absolutely null, and it would be even less likely to survive.

如果它在擴(kuò)張中松懈下來，它的實(shí)力絕對無效，它更加難以存活。

If the applicant has no insurable interest to the subject matter of insurance, the insurance contract will be null and void.

保險(xiǎn)利益決定保險(xiǎn)合同的效力問題，投保人對保險(xiǎn)標(biāo)的不具有保險(xiǎn)利益的，保險(xiǎn)合同無效。

If the value is NULL , the subscription has no scheduled time falling within the specified time range .

如果該值為NULL，則表示訂閱的計(jì)劃時間不在指定的時間范圍內(nèi)。

The bindtextdomain() function returns the directory pathname currently bound to the domain. If it fails, null pointer will be returned.

函數(shù)返回當(dāng)前綁定到域的目錄路徑名。如果失敗，返回空指針。

The null value in the system is an empty object that has no value.

系統(tǒng)中的null值是一個沒有值的空對象。

The error is caused by the fact that there is an overhead of two bytes for varying length and a one-byte overhead for null.

造成這個錯誤的原因是，變化的長度占用2字節(jié)，null占用1字節(jié)。

DT_SONAME This element holds the string table offset of a null-terminated string, giving the name of the shared object.

SONAME類型的數(shù)組項(xiàng)保存著一個以NULL結(jié)尾的字符串在字符串表中的偏移量，這個字符串是共享object的名字。