zxing qr code encoder example c# Select CustomerId, Name, City, State in Visual C#

Encoder QR Code JIS X 0510 in Visual C# Select CustomerId, Name, City, State

Select CustomerId, Name, City, State
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Where State = WA
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This Select statement returns a set of rows that contains four columns, CustomerId, Name, City, and State, all from the Customers table. However, instead of returning every row in the table, only the rows where the State column contains the string WA are returned. The other statements are equally easy to use. The statements have a number of common clauses, which means that if you know how to use one of the statements, learning how to use the others will be a straightforward process.
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Although the SQL language is an international standard, each database vendor is free to add extensions to the language. What this generally means is that the exact syntax of the SQL language will vary from one database to another. For the most part, these differ ences aren t important, especially if you stick to the core syntax.
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The Select Statement
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The Select statement is used to retrieve a set of rows from one or more tables and is probably the most commonly used statement in the SQL language. Here is its syntax:
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Select <selectexpression> [,<selectexpression>]
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From <tableref> [,<tableref>]
[Where <expression>]
[Order By <expression> [Asc|Desc] [, <expression> [Asc|Desc] ]
Where
<selectexpression> ::= * |
<selectitem> [ [As] <alias> ] <selectitem> ::= <column> | <table>.<column> | <tablealias>.<column> <expression> | <function> ( <expression> )
Part 6: Excel and the Outside World: Collaborating Made Easy
Microsoft Office Excel 2003 Programming Inside Out
<function> ::= Count | Max | Min | Sum <tableref> ::= <table> | <table> <tablealias>
Where <alias> is an alternate name of a column, <tablealias> is an alternate name of a table and, <expression> is a valid expression. Note The Select statement is the most complicated statement in the SQL language. Although the syntax in the preceding code might seem intimidating, keep in mind that it rep resents only a small part of the full syntax for a Select statement. However, the syntax listed here is generally supported by all database vendors, so you can use it with most applications.
Simple Select Statements
Rather than spend a lot of time trying to learn the syntax rules for the Select statement,
you re going to see a series of examples for common situations that illustrate how use the
Select statement.
Retrieving Everything
The following Select statement retrieves all the columns and rows from the Customers table:
Select *
From Customers
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22
The asterisk (*) indicates that all the columns in the table should be retrieved, and the From clause indicates that the command should pull the records from the Customers table.
Retrieving a List of Columns
Suppose that you don t want to retrieve all the columns from a table. You can use this Select statement to retrieve only the columns that you are planning to use. This query retrieves only the CustomerId and Name columns from the Customers table.
Select CustomerId, Name From Customers
Only Take What You Really Need Although using an * to retrieve columns makes your SQL statement easier to type, it can cause problems. The more data you retrieve from a database, the longer the query will take to process and the more additional memory will be required to hold the results. Granted, the extra time and space might be negligible for many queries, but it s still a good program ming practice to request only the resources you really need.
Excel and the Structured Query Language
Retrieving Rows
Both of the prior examples retrieve all the rows of data from the database. Although doing so can be useful in many situations, it can also cause significant problems, too. Imagine that you re working for a large company whose tables contain millions of rows of data. Retrieving all that data would overwhelm any computer. Instead of returning every row from a table, if all you really want to do is to retrieve the rows associated with a particular customer or for a particular Zip code, you can use the Where clause to pick just the rows you want.
If your Select statement doesn t contain a Where clause, you should probably ask if you really need all the data or if you just need some of the rows. Although it can be appropriate to retrieve all the rows from a table (for example, when you want to copy a table to a worksheet), in most cases it isn t necessary and could have a negative impact on your database server s performance.
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