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dictionary table.
Product Type table (producttype)Field Name Data Type field length descriptionProduct Type No. Char 16 primary key, unique code, not blankProduct Type varchar2 64 is used in lab products, production products, and discontinued products. Obtain from system dictionary
The table above can use the product type as the name in the system dictionary, and then enter the lab product, production product, and
ArticleDirectory
1. directly execute SQL query
2. directly execute SQL commands
Here we will introduce that the query by using LINQ to SQL is insufficient to meet the needs of specialized tasks. We can use the executequery method to execute the query by using LINQ to SQL, and then convert the query results to objects directly.
There are a lot of things worth learning about using LINQ to SQL. Here we will mainly introduce how to directly execute SQL commands and so
that are not discontinued) from the products table. the view is created with the following SQL:
Create view [current product list] as select productid, productname from products where discontinued = No
Then we can query the above view
Select * from [current product list]
Another view from the northwind Sample Database selects every product in the products ta
a row is added to the deleted table, it no longer exists in the Database Table. Therefore, the deleted table and the database table do not have the same rows.
• When creating a deleted table, the space is allocated from the memory. The deleted table is always stored in the cache.
• The trigger defined for the DELETE action does not execute the truncate table statement because the log does not record the truncate table statement.
Example
In this example, a trigger is created to update the
Java currently has 1.6, 1.7, and 1.8 versions of the JDK in the production environment, with 1.6, 1.7, and discontinued updates,1.8 Patch Update to 172, will be discontinued in early 2019, when the need to update the service can be purchased (Java SE Advanced, Java se Suite).At present the latest version of Java 10.0,java version of the current change is relatively large, just tested a bit myeclipse can not
, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, discontinued, CategoryName, SupplierName from (SELECT ProductID, ProductName, P.supplier IDs, P.categoryid, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, discontinued, C.Cat Egoryname, S.companyname as SupplierName, Row_number () over (order by ' + @sortExpression + ") as Rowrank from Pro Ducts as P INNER join Ca
= I.productid
The work process of the Delete trigger
When the delete trigger is triggered, rows deleted from the affected table are placed in a special deleted table. The deleted table is a logical table that retains a copy of the data rows that have been deleted. The deleted table also allows reference to the log data generated by the initialization DELETE statement.
When you use the Delete trigger, you need to consider the following issues and guidelines:
L When a row is
primary server failure is discovered, secondary server starts immediately, and then upstream traffic continues to compute.
Borealis
Borealis is a distributed streaming system developed in collaboration with Brandeis University, Brown University and MIT, which evolved from the previous streaming system Aurora and Medusa. Currently the Borealis system has been discontinued and the latest release release is disconti
can click TableAdapter in the DataSet Designer and then view and change the Insertcommand,updatecommand, and DeleteCommand properties in the Properties window. (Confirm that you have selected the TableAdapter and that the ProductsTableAdapter object is the selected item in the Drop-down box in the Properties window)Figure 23:tableadapter contains attributes such as Insertcommand,updatecommand, and DeleteCommandTo view or change the properties of these database commands, click CommandText, which
. The view "Current Product List" lists all products that are in use from the product table. This view is created using the following SQL:CREATE VIEW [Current Product List] asselect productid,productnamefrom productswhere discontinued=noWe can query the above view:SELECT * FROM [current Product List]Another view of the Northwind sample database selects products with all units in the product table that are higher than the average unit price:CREATE VIEW
. Countingvar q = from p in db. Products Group P is p.categoryid into G Select new { G.key, numproducts = G.count () };Statement Description: Use GROUP BY and count to get the number of products in each CategoryID.Description: First by CategoryID classification, remove the CategoryID value and the number of individual products.8. With conditional countvar q = from p in db. Products Group p by P.categoryid into G Select new { G.key, numproducts = g
can accurately submit the data we wish to submit to the user. Sample database Northwind has some views that are installed by default. The view "Current Product List" lists all products that are in use from the product table. This view is created using the following SQL: CREATE VIEWAS
SELECTProductid,productname Products
FROM
WHERE discontinued=no We can query the above view: SELECT * FROM [current Product List] Another view of the Northwind sample da
Northwind has some views that are installed by default. The view "Current Product List" lists all products that are in use from the product table. This view is created using the following SQL: CREATE VIEW [currentProduct List] as
SELECT productid,productname
from Products
WHERE Discontinued=No We can query the above view: SELECT * from [currentProduct List] Another view of the Northwind sample database selects products with all units in the prod
to submit to the user.Sample database Northwind has some views that are installed by default. The view "Current Product List" lists all products that are in use from the product table. This view is created using the following SQL:CREATE VIEW [Current Product List] asselect productid,productnamefrom productswhere discontinued=noWe can query the above view:SELECT * FROM [current Product List]Another view of the Northwind sample database selects product
p.categoryid into G Select new { G.key, numproducts = G.count () };Statement Description: Use GROUP BY and count to get the number of products in each CategoryID.Description: First by CategoryID classification, remove the CategoryID value and the number of individual products.8. With conditional countvar q = from p in db. Products Group p by P.categoryid into G Select new { G.key, numproducts = g.count (p = p.discontinued ) };Statement Description:
The JQuery UI 1.10 Upgrade Guide indicates JQuery UI 1.10 removed support for IE6The IE6 usage has dropped to a, enough point, jQuery UI no longer finds it necessary to support. As of 1.10.0, some portions of jQuery UI may isn't work properly in IE6. If you need to continue to support IE6, use the latest JQuery UI 1.9 release. Original: http://jqueryui.com/upgrade-guide/1.10/#removed-support-for-ie6 JQuery UI 1.11 Discontinued IE7 SupportAs of this r
table. This view is created using the following SQL:
Create view [Current Product List]SELECT ProductID, ProductNameFROM ProductsWHERE Discontinued = No we can query the above view:
SELECT * FROM [Current Product List] Another view of the Northwind Sample Database selects Products with prices higher than the average unit prices in the Products table:
Create view [Products Above Average Price]
SELECT ProductName, UnitPrice
FROM Products
WHERE
database engine uses SQL statements to recreate the data.SQL CREATE VIEW instanceYou can use a view within a query, within a stored procedure, or within another view. By adding functions and joins to the view, we can precisely submit the data we want to submit to users.
The sample database Northwind has some installed views by default. View "Current Product List" lists all Products in use from the Products table. This view is created using the following SQL:
Create view [Current Product List]
= number of identified errors/total identifiedaccuracy = identification of correct positive quantity/identification of correct quantityRecall rate r= Identify correct quantity/total correct amount (identify + unrecognized)F metric =2pr/(P+r)Data positive and negative equalization suitable for accurate rate data is not suitable for recall, accuracy, f measurementSeveral methods of model evaluation:Two models of ROC curves for K-fold cross-validation and random quadratic sampling evaluation8 Voca
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