SELECT TNAME, 12*SAL AS 年薪, ‘元’ as 币种单位 FROM TEACHER; (6) 通过以下两组 SQL 语句,看结果有何区别; SELECT SNO FROM SC; 该查询结果中没有去掉重复的行 SELECT DISTINCT SNO FROM SC; 该查询结果中去掉了重复的行 (7) 查询 1984 年和 1985 年出生的女生的信息; ...
SELECT ProductName,OrderID, UnitInStock, Quantity FROM Products, [Order Deails] WHERE Product.productID=[Order Details].ProductID AND UnitsInStock>Quantity 另一种方法是用Microsof JET SQL独有的JNNER JOIN 语法: FROM table1 INNER JOIN table2 ...
INSERTINTOCustomers(CustomerName,ContactName,Address,City,PostalCode,Country)SELECTSupplierName,ContactName,Address,City,PostalCode,CountryFROMSuppliers; 仅将德国供应商复制到 "Customers": 代码语言:sql 复制 INSERTINTOCustomers(CustomerName,City,Country)SELECTSupplierName,City,CountryFROMSuppliersWHERECountry='Germa...
Packaging Details PAPER CARTON OR PLYWOOD BOX Supply Ability Supply Ability 1000 Piece/Pieces per Month Show more Lead time Know your supplier Linyi Taprobane Trading Co., Ltd. 2 yrsLocated in CN View more productsView profile Product descriptions from the supplier ...
SELECTProductName, UnitPrice*(UnitsInStock+COALESCE(UnitsOnOrder,0))FROMProducts; MS Access MS Access 的IsNull()函数在表达式为 NULL 值时返回 TRUE(-1),否则返回 FALSE(0): SELECTProductName, UnitPrice*(UnitsInStock+IIF(IsNull(UnitsOnOrder),0, UnitsOnOrder))FROMProducts; ...
语法: SELECT 单行函数(参数列表) FROM 表名 WHERE 单行函数 字符串函数 使用实例: SELECT CONCAT(firstname,lastname) AS name FROM S_USER; SELECT LENGTH('HELLOWORLD'); SELECT UPPER('helloWorLD'); SELECT LOWER('HELLOWORLD'); SELECT SUBSTR('HELLOWORLD',2); SELECT SUBSTRING('HELLOWORL ...
若要在 OData 控制器中支援這些查詢,請新增一個名為GetProperty的方法,其中Property是屬性的名稱。 例如,取得 Name 屬性的方法將命名為GetName。 該方法應傳回該屬性的值: C# publicasyncTask<IHttpActionResult>GetName(intkey){ Product product =awaitdb.Products.FindAsync(key);if(product ...
FROM order_details od JOIN products p ON od.product_id = p.product_id WHERE o.order_id = od.order_id AND p.product_name = '特定产品'; 4.使用子查询进行更新: 你可以在SET子句中使用子查询来更新数据: 假设你想将所有销售人员的佣金比例增加10%: UPDATE sales_reps s SET s.commission_rate ...
Brand Name LR Car Model Original Quality 100% Professional Test Certification CE&ISO Packaging and delivery Packaging Details 1.Neutral packaging, custom2.Custom packaging3.Free design and labeling Selling Units: Single item Single package size: 10X10X10 cm Single gross weight: 0.500 kg Show more ...
In addition to pseudocolumns, the following query functions are provided (for details, seeHierarchical Recursion Query Functions): sys_connect_by_path(col, separtor): returns the connection path from the root node to the current row. Thecolparameter indicates the name of the column displayed in...