vb.net qr code sample True if a value is in a list. The list can be the result of a subquery. in VB.NET

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True if a value is in a list. The list can be the result of a subquery.
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Combining Predicates
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Quite often you ll need to use more than one predicate to filter your data. You can use the logical operators shown in Table 5-6. Table 5-6. SQL Logical Operators
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Combines two expressions, evaluating the complete expression as true only if both are true Negates a Boolean value Combines two expressions, evaluating the complete expression as true if either is true
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HERE (title LIKE 'Sales%' AND lastname ='Peacock') WHERE NOT (title LIKE 'Sales%' AND lastname ='Peacock') WHERE (title = 'Peacock' OR title = 'King')
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NOT OR
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When you use these operators, it s often a good idea to use parentheses to clarify the conditions. In complex queries, this may be absolutely necessary.
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Sorting Data
After you ve filtered the data you want, you can sort the data by one or more columns and in a certain direction. Since tables are by definition unsorted, the order in which rows are retrieved by a query is unpredictable. To impose an ordering, you use the ORDER BY clause: ORDER BY <column> [ASC | DESC] {, n}
CHAPTER 5 s MANIPULATING DATABASE DATA
The <column> is the column that should be used to sort the result. The {, n} syntax means you can specify any number of columns separated by commas. The result will be sorted in the order in which you specify the columns. The following are the two sort directions: ASC: Ascending (1, 2, 3, 4, and so on) DESC: Descending (10, 9, 8, 7, and so on) If you omit the ASC or DESC keywords, the sort order defaults to ASC. The following is the basic syntax for queries: SELECT <column> FROM <table> WHERE <predicate> ORDER BY <column> ASC | DESC Now that you ve seen it, you ll put this syntax to use in an example.
Try It Out: Writing an Enhanced Query
In this example, you ll code a query that uses the basic syntax just shown. You 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 Give it a try. Open a New Query window in SSMSE. Enter the following query and click Execute. You should see the results shown in Figure 5-5. select orderid,employeeid,customerid,orderdate,shipcountry from orders where employeeid = 5 and shipcountry in ('Brazil', 'France') order by shipcountry asc,orderdate asc
CHAPTER 5 s MANIPULATING DATABASE DATA
Figure 5-5. Filtering and sorting data
How It Works
Let s look at the clauses individually. The SELECT list specifies which columns you 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 Brazil or France. 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
CHAPTER 5 s MANIPULATING DATABASE DATA
Using SELECT INTO Statements
A SELECT INTO statement is used to create a new table containing (or not containing) the result set returned by a SELECT query. SELECT INTO copies the exact table structure and data into another table specified in the INTO clause. Usually, a SELECT query returns result sets to the client application. Including the # (hash) symbol before the table name results in creating a temporary table, which ends up in the tempdb system database, regardless of which database you are working in. Specifying the table name without the # symbol gives you a permanent table in your database (not in tempdb). The columns of the newly created table inherit the column names, their data types, whether or not columns can contain null values, and any associated IDENTITY property from the source table. However, the SELECT INTO clause does have some restrictions: it will not copy any constraints, indexes, or triggers from the source table.
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