qr code generator c# -- Query #1 SELECT SalesOrderID ,CustomerId ,OrderDate in Visual C#

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-- Query #1 SELECT SalesOrderID ,CustomerId ,OrderDate
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Lesson 1: Working with Tables and Data Types
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FROM Sales.SalesOrderHeader WHERE OrderDate BETWEEN '2008-08-18T00:00:00' AND '2008-08-18T23:59:59.997';
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-- Query #2 SELECT SalesOrderID ,CustomerId ,OrderDate FROM Sales.SalesOrderHeader WHERE OrderDate >= '20080818' AND OrderDate < '20080819';
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Even though both of these queries produce the same result, you should consider using the second query because it also correctly handles the new datetime2 data type. This is because the datetime2 data type can store fractions of time down to 100 nanoseconds (or .0000001 of a second), meaning that .997 is not the last millisecond of the day. Whenever you query time data, you should try to use a less than predicate to avoid relying on a specific second fraction precision. Finally, when converting a literal string to a datetime or smalldatetime data type, you should always use the YYYYMMDD format for dates without time, and the YYYY-MM-DDTHH:MI:SS.XXX format for dates with time. Both of these formats work independent of the language and date formats in effect on your connection.
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Date FORMatS
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For more information about how to affect the date formats that SQL Server accepts, see the articles SET DATEFORMAT and SET LANGUAGE in SQL Server Books Online.
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The new, and long-awaited, date and time data types in SQL Server 2008 are datetime2, date, time, and datetimeoffset. We start with the simplest data type, which is date. The date data type is something very simple and very useful, a data type that can store only dates. Because of this fact, this data type is perfect to use in all cases when no time is required. This simplifies queries because the time issue described earlier doesn t exist and because this data type saves storage space by allocating only 3 bytes. When converting a string literal to the date data type, you should always use the YYYY-MM-DD format (always including the century). The time data type is available to store a time without a date. For this data type, you can supply an optional parameter specifying the precision or number of decimals for a fraction of a second that you want the time instance to support. The possible values that you can supply are between 0 and 7, that is, between a second being the smallest value (0) and 100 nanoseconds being the smallest value (7). If you do not specify this parameter when declaring the data type, a default of 7 is used. When converting a string literal to the time data type, you should always use the HH:MI:SS.NNNNNNN format. The storage size used by the time data type depends on the precision specified. Table 3-5 lists the storage space used depending on the specified precision.
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Tables, Data Types, and Declarative Data Integrity
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tabLe 3-5 Time Data Type Storage Requirements
PReciSiOn
StORaGe
0 to 2 3 to 4 5 to 7
3 bytes 4 bytes 5 bytes
The datetime2 data type is a combination of the date and time data types, with the same precision parameter for fractional seconds as the time data type. When converting a string literal to the datetime2 data type, you should always use the YYYY-MM-DD HH:MI:SS. NNNNNNN format. Table 3-6 lists the storage space used by the datetime2 data type depending on the precision specified.
tabLe 3-6 Datetime2 Data Type Storage Requirements
PReciSiOn
StORaGe
0 to 2 4 to 5 6 to 7
6 bytes 7 bytes 8 bytes
The final date and time data type available in SQL Server 2008 is the datetimeoffset data type. In addition to what the datetime2 data type stores, this data type stores a time zone offset. This can be very useful when it is important to know not only the time that something happened, but also in which time zone it happened. When converting a string literal to the datetimeoffset data type, you should always use the YYYY-MM-DD HH:MI:SS.NNNNNNN +|-HH:MI format. Table 3-7 lists the storage space used by the datetimeoffset data type depending on the precision specified.
tabLe 3-7 Datetimeoffset Data Type Storage Requirements
PReciSiOn
StORaGe
0 to 2 4 to 5 6 to 7
6 bytes 7 bytes 8 bytes
Table Basics
The table is the most central object of any RDBMS. In SQL Server, there are several variations of tables: permanent tables (or just tables), local temporary tables, global temporary tables, and table variables. Besides these variations, there are also table types and table parameters,
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