free barcode generator in vb.net SQL and Objects in Software

Generator Code 128A in Software SQL and Objects

SQL and Objects
Code 128 Code Set B Scanner In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Creating Code 128B In None
Using Barcode generation for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
SQL TODAY AND TOMORROW
Scanning Code-128 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Code 128 Code Set A Drawer In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create USS Code 128 image in Visual Studio .NET applications.
Figure 24-6.
Code 128C Maker In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Code 128B image in ASP.NET applications.
Painting USS Code 128 In .NET Framework
Using Barcode printer for Visual Studio .NET Control to generate, create ANSI/AIM Code 128 image in .NET framework applications.
Tables with collection data typed columns
Code 128 Code Set A Encoder In VB.NET
Using Barcode generator for .NET framework Control to generate, create Code 128B image in .NET framework applications.
Encoding GS1 - 12 In None
Using Barcode drawer for Software Control to generate, create UPC A image in Software applications.
data type. The items of a collection can be row data types. It s also possible to define collections within collections where that makes sense. For example, the projects in this example might have subprojects that must be tracked for each technician. At each level of additional complexity, the complexity of the stored procedure language (SPL) and SQL expressions that are required to manipulate the data items and process them increases accordingly.
Data Matrix Creator In None
Using Barcode generator for Software Control to generate, create ECC200 image in Software applications.
ANSI/AIM Code 128 Generation In None
Using Barcode generator for Software Control to generate, create Code-128 image in Software applications.
SQL: The Complete Reference
Creating GTIN - 13 In None
Using Barcode printer for Software Control to generate, create EAN13 image in Software applications.
Paint Barcode In None
Using Barcode creation for Software Control to generate, create bar code image in Software applications.
Oracle also provides extensive support for collection-type data, through two different Oracle object-relational extensions: I Varying arrays. A varying array is an ordered collection of data items, all having the same data type. There is no requirement that the items in the array be unique. You define the maximum number of data items that can occur when you specify a varying array type for a column. Oracle provides extensions to SQL to access the individual items within the array. I Nested tables. A nested table is an actual table within a table. A column with a nested table type contains individual data items that are themselves tables. Oracle actually stores the nested table data separately from the main table that contains it, but it uses SQL extensions to process nested references to the inner table. Unlike a varying array, a nested table can contain any number of rows. A column within a table can be declared to have a VARRAY (varying array) or TABLE OF (nested table) structure. Here are some Oracle CREATE TYPE and CREATE TABLE statements that use varying arrays and nested tables to achieve table structures like those shown in Figure 24-6:
USD8 Drawer In None
Using Barcode maker for Software Control to generate, create Code 11 image in Software applications.
Make Barcode In None
Using Barcode maker for Office Word Control to generate, create barcode image in Office Word applications.
CREATE TABLE EMPL_NUM NAME ADDRESS SLS_MGR SALARY QUOTA QTR_TGT REPS ( INTEGER, NAME_TYPE, ADDR_TYPE, INTEGER, MONEY(9,2), MONEY(9,2), VARRAY(4) OF NUMBER(9,2));
Make USS Code 39 In Visual Studio .NET
Using Barcode generator for Reporting Service Control to generate, create Code39 image in Reporting Service applications.
Bar Code Scanner In Visual Studio .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
/* /* /* /*
Scan Universal Product Code Version A In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Linear 1D Barcode Generation In Java
Using Barcode generation for Java Control to generate, create Linear 1D Barcode image in Java applications.
employee number of mgr */ annual salary */ sales quota */ four quarterly tgts */
UCC - 12 Creation In Java
Using Barcode drawer for Java Control to generate, create UCC - 12 image in Java applications.
Drawing Data Matrix ECC200 In None
Using Barcode encoder for Online Control to generate, create DataMatrix image in Online applications.
CREATE TYPE DEGR_TYPE AS OBJECT ( ( DEGREE VARCHAR(3), SCHOOL VARCHAR(15)); CREATE TABLE EMPL_NUM NAME ADDRESS SALARY YRS_EXPER DEGREES NESTED TABLE ENGINEERS ( INTEGER, NAME_TYPE, ADDR_TYPE, NUMBER(9,2), /* annual salary */ INTEGER, /* years of experience */ TABLE OF DEGR_TYPE); DEGREES STORE AS DEGREES_TABLE;
24:
SQL and Objects
The quarterly target information for the REPS table is most easily represented as an Oracle varying array column. There will be exactly four quarters of information, so the maximum size of the array is known in advance. In this example, the varying array contains a simple data item as its element, but it s also common to define varying arrays whose items are themselves abstract (structured) data types. The academic degree information for the ENGINEERS table is represented as a nested table. For a data item like this one, you could decide to place an upper limit on the number of rows and use a varying array structure instead, but in general, if the maximum number of items is unknown, a nested table is the right choice. In this case, the nested table has an abstract data type composed of two attributes. Each row of the nested table will contain information about a degree granted and the school that granted it.
SQL TODAY AND TOMORROW
Querying Collection Data
Collection-valued columns complicate the process of querying the tables that contain them. In the SELECT item list, they generate multiple data values for each row of query results. In search conditions, they don t contain individual data items, but it s sometimes convenient to treat them as sets of data. The object-relational databases typically provide a limited set of SQL extensions or extend existing SQL concepts to provide simple queries involving collection data. For more advanced queries, they require you to write stored procedure language programs with loop structures that process the collection data items one by one. For query purposes, Informix treats the collection types as if they were a set of data values, like the values that might be returned by a subquery. You can match individual items within a collection using the SQL IN search condition. Here is a query that finds any technicians who work on a project named bingo :
SELECT EMPL_NUM, NAME FROM TECHNICIANS WHERE 'bingo' IN (PROJECTS);
The name of the collection-valued column (in this case, the set-valued column PROJECTS) appears in parentheses. Informix treats the members of the collection as a set and applies the IN matching condition. In interactive SQL, you can put a collection-valued column in the select item list. Informix displays the collection of data as either a SET, LIST, or MULTISET in the displayed output. To process collectionvalued data in the select list of a programmatic request (that is, from a program using ESQL or a call-level API), you must use special API extensions and/or extensions to the Informix stored procedure language.
Copyright © OnBarcode.com . All rights reserved.