vb.net qr code dll SELECT <column> FROM <table> WHERE <predicate> ORDER BY <column> ASC | DESC in VB.NET

Make DataMatrix in VB.NET SELECT <column> FROM <table> WHERE <predicate> ORDER BY <column> ASC | DESC

SELECT <column> FROM <table> WHERE <predicate> ORDER BY <column> ASC | DESC
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Let s use the syntax in an example.
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CHAPTER 3 s INTRODUCING SQL
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Try It Out: Writing an Enhanced Query
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Let s code a query that uses all this. We want to do the following: Select all the orders that have been handled by employee 5. Select the orders shipped to either France or Brazil. Display only OrderID, EmployeeID, CustomerID, OrderDate, and ShipCountry. Sort the orders by the destination country and the date the order was placed. Does this sound complicated Let s try it. 1. Enter the following query in SSMSE:
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select orderid, employeeid, customerid, orderdate, shipcountry from orders where employeeid = 5 and shipcountry in ('Brazil', 'France') order by shipcountry asc, orderdate asc
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2. Click F5, and you should see results, as in Figure 3-7.
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Figure 3-7. Filtering and sorting data
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Let s look at the clauses individually. The SELECT list specifies which columns we want to use:
select orderid, employeeid, customerid, orderdate, shipcountry
The FROM clause specifies that you want to use the Orders table:
from orders
The WHERE clause is a bit more complicated. It consists of two predicates that individually state the following: EmployeeID must be 5. ShipCountry must be in the list of Brazil or France.
CHAPTER 3 s INTRODUCING SQL
As these predicates are combined with AND, they both must evaluate to true for a row to be included in the result:
where employeeid = 5 and shipcountry IN ('Brazil', 'France')
The ORDER BY clause specifies the order in which the rows are sorted. The rows will be sorted by ShipCountry first and then by OrderDate:
order by shipcountry asc, orderdate asc
Inserting Data
The second important task you need to be able to do is add data; that is, add rows, to a table. You do this with the INSERT statement. The INSERT statement is much simpler than a query, particularly because the WHERE and ORDER BY clauses have no meaning when inserting data, and therefore aren t used.
s Note The SQL standard calls the INSERT, UPDATE, and DELETE statements data manipulation language
(DML). BOL includes SELECT in DML, which makes the term far less precise and useful. In this book we use DML in the SQL standard sense.
A basic INSERT statement has these parts:
INSERT INTO <table> (<column1>, <column2>, ..., <columnN>) VALUES (<value1>, <value2>, ..., <valueN>)
Using this syntax, let s add a new row to the Shippers table of the Northwind database. Before you insert it, let s look at the table. In the SSMSE Object Explorer, right-click the Shippers table and click Open Table. The table has three rows, which are displayed in a tabbed window (see Figure 3-8).
CHAPTER 3 s INTRODUCING SQL
Figure 3-8. Shippers before adding a row
The first column, ShipperID, is an IDENTITY column, and you can t insert values into it explicitly SSE makes sure a unique value is inserted for you. So, the INSERT statement looks like this:
insert into shippers ( companyname, phone ) values ('We Shred Them Before You Get Them', '555-1234')
Executing this statement in the query window should produce a Messages window reporting (1 row(s) affected). After the insert, return to the Table - dbo.Shippers window and click the exclamation point to refresh the table display. You ll see that the new row has been added, as in Figure 3-9. (To see the full company name, double-click the separator between the CompanyName and Phone columns.)
CHAPTER 3 s INTRODUCING SQL
Figure 3-9. Shippers after adding a row
Be careful to insert data of the correct data type. In this example, both the columns are of character type, so you inserted strings. If one of the columns had been of integer type, you would have inserted an integer value instead. We ll describe the SQL data types soon, in the T-SQL Data Types section.
Updating Data
The third important task you need to be able to do is change data. You do this with the UPDATE statement. When coding UPDATE statements, you must be careful to include a WHERE clause, or you ll update all the rows in a table. So, always code an appropriate WHERE clause, or you won t change the data you intend to change.
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