free barcode generator in vb.net SQL Basics in Software

Creating USS Code 128 in Software SQL Basics

SQL Basics
Code 128 Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing Code 128 Code Set A In None
Using Barcode encoder for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
are used to store compressed video images, executable code, and other types of unstructured data. SQL Server s IMAGE data type, for example, can store a stream of up to 2 billion bytes of data. I Non-Roman characters. As databases grow to support global applications, DBMS vendors have added support for fixed-length and variable-length strings of 16-bit characters used to represent Kanji and other Asian and Arabic characters. While most modern databases support storing and retrieving such characters (often using the UNICODE convention for representing them), support for searching and sorting on these GRAPHIC and VARGRAPHIC types varies widely.
Reading Code 128B In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Code 128A Encoder In C#.NET
Using Barcode creator for .NET Control to generate, create Code 128A image in .NET applications.
RETRIEVING DATA
Make Code-128 In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create Code128 image in ASP.NET applications.
Code-128 Drawer In Visual Studio .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code 128 image in Visual Studio .NET applications.
Table 5-4 lists the data types specified in the ANSI/ISO SQL standard.
Code 128C Drawer In VB.NET
Using Barcode creation for .NET framework Control to generate, create Code 128 Code Set A image in .NET applications.
Printing Code 39 Extended In None
Using Barcode creation for Software Control to generate, create Code-39 image in Software applications.
Data Type
Encoding UPC-A Supplement 2 In None
Using Barcode printer for Software Control to generate, create GS1 - 12 image in Software applications.
Bar Code Drawer In None
Using Barcode creator for Software Control to generate, create bar code image in Software applications.
CHAR(len) CHARACTER(len) VARCHAR(len) CHAR VARYING(len) CHARACTER VARYING(len) NCHAR(len) NATIONAL CHAR(len) NATIONAL CHARACTER(len)
Code128 Encoder In None
Using Barcode maker for Software Control to generate, create Code 128C image in Software applications.
Generate European Article Number 13 In None
Using Barcode drawer for Software Control to generate, create European Article Number 13 image in Software applications.
Description
ISBN - 10 Maker In None
Using Barcode maker for Software Control to generate, create International Standard Book Number image in Software applications.
Paint UCC-128 In Java
Using Barcode maker for BIRT Control to generate, create GTIN - 128 image in BIRT applications.
Fixed-length character strings Variable-length character strings*
Recognize Bar Code In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Decode European Article Number 13 In .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
Fixed-length national character strings*
UPCA Recognizer In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
UPC A Encoder In .NET
Using Barcode encoder for Reporting Service Control to generate, create UPCA image in Reporting Service applications.
Variable-length national character strings* NCHAR VARYING(len) NATIONAL CHAR VARYING(len) NATIONAL CHARACTER VARYING(len) INTEGER INT SMALLINT BIT(len) BIT VARYING(len) NUMERIC(precision, scale) DECIMAL(precision, scale) DEC(precision, scale) FLOAT(precision) Table 5-4. Integer numbers Small integer numbers Fixed-length bit strings* Variable-length bit strings* Decimal numbers
Barcode Drawer In Java
Using Barcode generator for BIRT Control to generate, create barcode image in BIRT reports applications.
Barcode Maker In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
Floating point numbers
ANSI/ISO SQL Data Types
SQL: The Complete Reference
Data Type
REAL DOUBLE PRECISION DATE TIME(precision) TIMESTAMP(precision) INTERVAL *new data type in SQL2 Table 5-4.
Description
Low-precision floating point numbers High-precision floating point numbers Calendar dates* Clock times* Dates and times* Time intervals*
ANSI/ISO SQL Data Types (continued)
The differences between the data types offered in various SQL implementations is one of the practical barriers to the portability of SQL-based applications. These differences have come about as a result of innovation as relational databases have evolved to include a broader range of capabilities. This has been the typical pattern: I A DBMS vendor adds a new data type that provides useful new capabilities for a certain group of users. I Other DBMS vendors add the same or similar data types, adding their own innovations to differentiate their products from the others. I Over several years, the popularity of the data type grows, and it becomes a part of the mainstream set of data types supported by most SQL implementations. I The standards bodies become involved to try to standardize the new data type and eliminate arbitrary differences between the vendor implementations. The more well-entrenched the data type has become, the more difficult the set of compromises faced by the standards group. Usually, this results in an addition to the standard that does not exactly match any of the current implementations. I DBMS vendors slowly add support for the new standardized data type as an option to their systems, but because they have a large installed base that is using the older (now proprietary ) version of the data type, they must maintain support for this form of the data type as well. I Over a very long period of time (typically several major releases of the DBMS product), users migrate to the new, standardized form of the data type, and the DBMS vendor can begin the process of obsoleting the proprietary version.
5:
SQL Basics
Date/time data provides an excellent example of this phenomenon and the data type variations it creates. DB2 offered early date/time support, with three different date/time data types: I DATE. Stores a date like June 30, 1991 I TIME. Stores a time of day like 12:30 P.M. I TIMESTAMP. A specific instant in history, with a precision down to the nanosecond Specific dates and times can be specified as string constants, and date arithmetic is supported. Here is an example of a valid query using DB2 dates, assuming that the HIREDATE column contains DATE data:
SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '05/30/1989' + 15 DAYS
RETRIEVING DATA
SQL Server was introduced with a single date/time data type, called DATETIME, which closely resembles the DB2 TIMESTAMP data type. If HIRE_DATE contained DATETIME data, SQL Server could accept this version of the query (without the date arithmetic):
SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '06/14/1989'
Since no specific time on June 14, 1989, is specified in the query, SQL Server defaults to midnight on that date. The SQL Server query thus really means:
SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '06/14/1989 12:00AM'
If a salesperson s hire date were stored in the database as noon on June 14, 1989, the salesperson would not be included in the SQL Server query results but would have been included in the DB2 results (because only the date would be stored). SQL Server also supports date arithmetic through a set of built-in functions. Thus, the DB2-style query can also be specified in this way:
SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= DATEADD(DAY, 15, '05/30/1989')
Copyright © OnBarcode.com . All rights reserved.