gs1-128 font excel Query Formulation in Software

Drawer QR-Code in Software Query Formulation

Query Formulation
Quick Response Code Drawer In None
Using Barcode generator for Software Control to generate, create QR Code image in Software applications.
QR Code Decoder In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
10-3-1 Interrogative Query Formulation Interrogative systems presuppose the least knowledge The ability to pick up a telephone may be the only requirement posed Successive questions posed by the computer are answered in simple yes-no or multiple-choice mode, or by the entry of commonly known identifying terms or names of objects A HELP function is provided in case the user fails to understand the terms presented by the system This approach can be relatively slow but is satisfactory if not carried out for extensive periods
Denso QR Bar Code Generation In Visual C#.NET
Using Barcode creator for VS .NET Control to generate, create QR Code image in VS .NET applications.
QR Code JIS X 0510 Encoder In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Examples of such devices are credit inquiry system, using special telephones, and serve-yourself banking terminals
QR-Code Creator In VS .NET
Using Barcode drawer for .NET framework Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Quick Response Code Printer In Visual Basic .NET
Using Barcode creation for VS .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
When a higher rate of data ow is required, display terminals can interrogate a user e ectively by permitting several choices in one interaction The user may indicate the chosen item by means of a lightpen or a touchscreen One selection can lead to presentation of a more speci c set of choices The hierarchical nature of this query process is supported well by hierarchical le systems
Paint Code 128 Code Set A In None
Using Barcode printer for Software Control to generate, create Code 128 image in Software applications.
GTIN - 128 Printer In None
Using Barcode drawer for Software Control to generate, create EAN 128 image in Software applications.
Given a patient le as illustrated in Fig 4-25, the choices would be presented in the sequence: Select drug, laboratory, other data Patient name Date Problem Drug type Frequency Figure 10-5 shows some sample screens
Bar Code Generation In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Printing Code 3 Of 9 In None
Using Barcode maker for Software Control to generate, create Code 3 of 9 image in Software applications.
The fanout on a display screen can provide a few dozen choices, so that when following a hierarchy after a few screen selections a great deal of data can be accessed A high rate of communication capability is required to support this type of query formulation, since screen selection can be accomplished in a fraction of a second
ECC200 Drawer In None
Using Barcode creator for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
GTIN - 13 Printer In None
Using Barcode encoder for Software Control to generate, create GS1 - 13 image in Software applications.
10-3-2 Tabular Queries When access to the system is limited, preparation of the query using a printed questionnaire is another alternative Directions are provided specifying the choice of parameters to be entered to describe the query If the user has adequate knowledge about the database, a query can be formulated in a short time and then be presented to the system Many report generators work very e ectively in this mode The
Encoding Code 93 In None
Using Barcode generator for Software Control to generate, create ANSI/AIM Code 93 image in Software applications.
Bar Code Maker In Java
Using Barcode creation for Eclipse BIRT Control to generate, create bar code image in Eclipse BIRT applications.
Information Retrieval
Scan UPC Code In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Creating UPCA In Objective-C
Using Barcode maker for iPad Control to generate, create UPCA image in iPad applications.
form of a query is often matched by database systems which provide tabular representations of their content A tabular query form will contain attribute names as well as space to indicate conditionals and simple result expressions Typically several levels of subtotals and totals can be produced in the result Modi ers are available to indicate ordering and grouping Generalized computation tends to be awkward; an example is shown as Fig 10-6 When more complex computations or selection criteria are needed, the rigid tabular structure becomes inadequate To overcome such problems statements and expressions as seen in computer languages are introduced The formulation of queries then requires increased expertise To avoid the need for knowledge of the schema contents, a technique of specifying queries by example has been developed [Zloof77 ] The same query as above formulated by example is shown in Fig 10-7 Associated with the example entries are notations indicating selection and printing
Make Code 3/9 In Objective-C
Using Barcode generation for iPad Control to generate, create USS Code 39 image in iPad applications.
Barcode Creation In VB.NET
Using Barcode generator for .NET Control to generate, create barcode image in .NET framework applications.
Sec 10-3
Barcode Generator In Objective-C
Using Barcode drawer for iPad Control to generate, create bar code image in iPad applications.
Drawing EAN / UCC - 13 In Java
Using Barcode printer for Eclipse BIRT Control to generate, create EAN-13 image in Eclipse BIRT applications.
Query Formulation
Interaction is used to construct queries by example First the database or le name is requested This permits the system to list the schema elements on the display terminal Those schema elements which are not desired as part of the query or the responses are ignored
Here the spouse is ignored, and this heading can be deleted Empty columns of the table can also be requested and named Into the columns values for the query constants can be placed Here JNerous and >10000 provide constants Underlining indicates that the values are samples, and the P pre x indicates that the column is to be printed An extra underline indicates grouping for the generation of TOTALs
Several relations can be included in a query A join is generated when the same underlined sample term appears in both relations If the supervised employees are also to be listed in the evaluation, Calhoun would be placed in the supervisor column of supervision; such a use is equivalent to de ning a tuple variable The system is oriented toward a relational database but has been explored for other environments This query approach has been shown to have surprising power Database schemas can also be speci ed by use of examples Speci cations by example are an e ective means to describe output formats to computer systems When conditions become complex, the coding rules required may diminish the initial simplicity
10-3-3 Interactive Query Statements For general query processing interactive methods provide the greatest exibility The user formulates a query using a query language, and the query statement is parsed and executed The response to one query often leads the user to formulate further queries Many languages to state queries have been developed They range from very formal, calculus-oriented languages to relatively simple languages which provide statements similar to those found in procedural languages These languages are always in uenced by the underlying database structure, by the degree of on-line interaction supported, and by the communication devices used While techniques from procedural languages are used to parse and execute query statements, no common, system-independent query language has yet been accepted A similar query is speci ed in a display-oriented language (ASI-INQUIRY) as in Example 10-3
Example 10-3
Copyright © OnBarcode.com . All rights reserved.