如果驅動程式支援某些資料表的目錄,但不支援其他資料表,例如當驅動程式從不同的 DBMS 擷取資料時,空字串 (「」) 表示沒有目錄的資料表。 CatalogName 不能包含字串搜尋模式。 如果SQL_ATTR_METADATA_ID 語句屬性設定為 SQL_TRUE, 則CatalogName 會被視為識別碼,而且其大小寫並不重要。 如果它是
[输入]目录名称。 如果驱动程序支持某些表的目录,但不支持其他表的目录,例如当驱动程序从不同的 DBMS 检索数据时,空字符串 (“”) 表示那些没有目录的表。CatalogName不能包含字符串搜索模式。 如果SQL_ATTR_METADATA_ID 语句属性设置为 SQL_TRUE,则 CatalogName被视为标识符,其大小写并不重要。 如果为SQL_FAL...
So the defining function of this table is not a one-to-one function. Some functions are onto functions. This means that all possible output values can be generated by the function. One output value of TX is one member of CP{[TX.C2,TX.C3]}, which is the Cartesian Product of the ...
SQLCHAR *CatalogName輸入三部分表格名稱的型錄限定元。如果目標 DBMS 不支援 3 個部分的命名,且CatalogName不是空值指標且沒有指向零長度字串,則會傳回空的結果集,並傳回 SQL_SUCCESS。 否則,這是支援三部分命名之 DBMS 的有效過濾器。 SQLSMALLINTNameLength1輸入儲存CatalogName所需的 SQLCHAR 元素 (或此函數...
The value of a primary key should be changed frequently. Is the statement true or false? What is the primary use of the ping command? What is a product key? The primary input devices for smartphones are what? What is the main function of the CPU?
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According to Kim et al., derivatives of chitin may be classified into two categories. These authors reported that in each case theN-acetyl groups were removed while the exposed amino function reacts either with acyl chlorides, or anhydrides to give the group NHCOR, or is modified by reductive...
The SQLPrimaryKeys() function returns a list of column names that comprise the primary key for a table.
We’ll create a new table called Employees_3. It’s safe to assume that anyone we hire would be less than 100 years old at the time of hire. We can add a Check Constraint on DateOfBirth and use the DATEADD function to calculate the date 100 years ago with the following SQL statement...
What function does an attribute of an entity perform in a DBMS? What is the difference between a record and a field? (a) Explain the pigeonhole principle. (b) Give an example that illustrates the use of the pigeonhole principle. What is the significance of 3-tier architecture ...