作者: 懸崖 時(shí)間: 2025-3-22 00:09
Lebenszyklussteuerung von IV-Anwendungenr information about members, teams, and tournaments, as well as tables that connect these values; for example, which members play on which teams, enter which tournaments, and so on. To make the best use of our data, we will need to inspect values from different tables to retrieve the information we require.作者: 流浪 時(shí)間: 2025-3-22 01:33 作者: perpetual 時(shí)間: 2025-3-22 05:44 作者: Incise 時(shí)間: 2025-3-22 11:55 作者: 機(jī)構(gòu) 時(shí)間: 2025-3-22 15:32 作者: 不能逃避 時(shí)間: 2025-3-22 19:56
Lebenszyklussteuerung von IV-Anwendungenr information about members, teams, and tournaments, as well as tables that connect these values; for example, which members play on which teams, enter which tournaments, and so on. To make the best use of our data, we will need to inspect values from different tables to retrieve the information we 作者: Angioplasty 時(shí)間: 2025-3-22 23:54 作者: Perineum 時(shí)間: 2025-3-23 02:40
IV-Controlling in der Softwarewartunguery to find all the members who have entered tournament 36. The condition TourID = 36 can be evaluated for each row in the Entry table to achieve the required result. However, if we want to find members who have entered both tournaments 36 and 24, we cannot do this by inspecting just one row of the作者: endure 時(shí)間: 2025-3-23 07:35
IV-Controlling in der Softwarewartung be considered a set. We can then use set operations to help with combining and extracting specific information. The types of questions that set operations help with are those such as “which people are in both these sets?” or “which people are in this set but not that one?”作者: Graduated 時(shí)間: 2025-3-23 09:47 作者: lactic 時(shí)間: 2025-3-23 14:40 作者: 褻瀆 時(shí)間: 2025-3-23 19:41
Eine Schlankheitskur für die IVeries will probably be carried out in the blink of an eye. Complicating your life in an attempt to make your queries a little faster does not make a great deal of sense. However, if you have (or might have) vast amounts of data and speed is absolutely critical, you will need more skill and experienc作者: 條街道往前推 時(shí)間: 2025-3-23 23:50 作者: Feedback 時(shí)間: 2025-3-24 03:41
Ein Konzept für das IV-Benchmarking all may not be well. In the previous chapter, we looked at the importance of checking the output to confirm that (at least some of) the expected rows are retrieved, as well as checking to make sure that (at least some) incorrect (or irrelevant) rows are not being returned.作者: excursion 時(shí)間: 2025-3-24 06:42
Jose Francisco Sáenz Cogollo,J. BustamanteBefore getting into the nuts and bolts of how to specify queries, we will review some of the ideas and terminology associated with relational databases. We will also look at data models, which are a succinct way of depicting how a particular database is put together; that is, what data is being kept where and how everything is interrelated.作者: Heart-Rate 時(shí)間: 2025-3-24 12:28 作者: LAP 時(shí)間: 2025-3-24 16:06 作者: SPECT 時(shí)間: 2025-3-24 19:03
Eine Schlankheitskur für die IVMost of the examples in this book use the golf club database. Visit the catalog page for this book on the Apress website, look under the Source Code/Downloads tab, and you will find an Access version of this database and also the SQL scripts for creating and populating the tables.作者: 事物的方面 時(shí)間: 2025-3-25 00:33
Controlling verteilter InformationssystemeNo new concepts are presented here that have not been discussed previously—it is just the notation that is different. The more formal notation allows queries to be expressed very concisely, and the underlying mathematics can be useful when dealing with complex situations. We will use the database described in Appendix 1 for the examples.作者: Suppository 時(shí)間: 2025-3-25 06:46 作者: Minikin 時(shí)間: 2025-3-25 10:35
A First Look at Joins,In the previous chapter, we looked at how to retrieve subsets of rows and/or columns from a single table.作者: 特征 時(shí)間: 2025-3-25 15:08 作者: vocation 時(shí)間: 2025-3-25 15:59 作者: 背信 時(shí)間: 2025-3-25 20:19
Relational Notation,No new concepts are presented here that have not been discussed previously—it is just the notation that is different. The more formal notation allows queries to be expressed very concisely, and the underlying mathematics can be useful when dealing with complex situations. We will use the database described in Appendix 1 for the examples.作者: Lipohypertrophy 時(shí)間: 2025-3-26 01:57
Clare ChurcherBroad appeal – Developers, web designers, database administrators, even power users working with Microsoft Access need to know something of SQL.Clarity – Author‘s previous book, Beginning Database Des作者: NEEDY 時(shí)間: 2025-3-26 05:02
http://image.papertrans.cn/b/image/182524.jpg作者: 食料 時(shí)間: 2025-3-26 10:55
Simple Queries on One Table,r information about members, teams, and tournaments, as well as tables that connect these values; for example, which members play on which teams, enter which tournaments, and so on. To make the best use of our data, we will need to inspect values from different tables to retrieve the information we require.作者: 發(fā)出眩目光芒 時(shí)間: 2025-3-26 13:52
Subqueries,oins can be used to retrieve data from two or more tables. In many of the examples it was possible to construct quite different SQL queries to produce the same result. Depending on the context or the problem you will probably find that one approach will feel more natural.作者: Arb853 時(shí)間: 2025-3-26 17:00 作者: Incise 時(shí)間: 2025-3-26 23:28
How to Tackle a Query,nipulated to produce the required result. These queries are expressed using keywords describing operations such as INNER JOIN and INTERSECTION. We also looked at how to express queries in terms of the outcome approach, which describes the criteria that the resulting data must satisfy rather than the process for retrieving the result.作者: 旅行路線 時(shí)間: 2025-3-27 02:20 作者: 子女 時(shí)間: 2025-3-27 07:14 作者: 平庸的人或物 時(shí)間: 2025-3-27 12:30
Subqueries,oins can be used to retrieve data from two or more tables. In many of the examples it was possible to construct quite different SQL queries to produce the same result. Depending on the context or the problem you will probably find that one approach will feel more natural.作者: 極微小 時(shí)間: 2025-3-27 16:19 作者: faction 時(shí)間: 2025-3-27 21:05 作者: 密碼 時(shí)間: 2025-3-27 22:40 作者: 小溪 時(shí)間: 2025-3-28 05:08
Window Functions,to perform aggregates on a “window” of data based upon the current row. This provides an elegant way to specify queries to perform actions such as ranking, running totals, and rolling averages. Window functions also provide considerable flexibility when it comes to grouping data for aggregation as t作者: patella 時(shí)間: 2025-3-28 09:44
Efficiency Considerations,eries will probably be carried out in the blink of an eye. Complicating your life in an attempt to make your queries a little faster does not make a great deal of sense. However, if you have (or might have) vast amounts of data and speed is absolutely critical, you will need more skill and experienc作者: 藥物 時(shí)間: 2025-3-28 14:08 作者: Kidnap 時(shí)間: 2025-3-28 16:19
Common Problems, all may not be well. In the previous chapter, we looked at the importance of checking the output to confirm that (at least some of) the expected rows are retrieved, as well as checking to make sure that (at least some) incorrect (or irrelevant) rows are not being returned.作者: violate 時(shí)間: 2025-3-28 19:49
ult using set operations.Translate natural language questions into database queries providing meaningful information to the business.Avoid errors associated with duplicated and null values.Summarize data with a978-1-4842-1954-6978-1-4842-1955-3作者: eulogize 時(shí)間: 2025-3-29 00:14 作者: 坦白 時(shí)間: 2025-3-29 07:08 作者: 戰(zhàn)役 時(shí)間: 2025-3-29 08:16
Eine Schlankheitskur für die IVe than you are likely to get from reading one chapter in a beginners’ book. Having said that, you are likely to have people tell you that it matters how you express your queries or that you should be indexing your tables, so it is handy to have some idea about what is going on behind the scenes and understand some of the terminology.作者: Intellectual 時(shí)間: 2025-3-29 12:59 作者: 想象 時(shí)間: 2025-3-29 17:02
Efficiency Considerations,e than you are likely to get from reading one chapter in a beginners’ book. Having said that, you are likely to have people tell you that it matters how you express your queries or that you should be indexing your tables, so it is handy to have some idea about what is going on behind the scenes and understand some of the terminology.作者: Myocyte 時(shí)間: 2025-3-29 20:11
SQL.Clarity – Author‘s previous book, Beginning Database Des.Get started on mastering the one language binding the entire database industry. That language is SQL, and how it works is must-have knowledge for anyone involved with relational databases, and surprisingly also for anyone involved with NoS作者: heterodox 時(shí)間: 2025-3-30 03:45 作者: SIT 時(shí)間: 2025-3-30 04:21
Mary Degener-B?ning,Beate Schmiderent ways to find aggregates. For example, we might want to count the number of tournament entries in each individual year, or we might want to find the number of entries in each particular tournament.作者: Metamorphosis 時(shí)間: 2025-3-30 08:59 作者: hyperuricemia 時(shí)間: 2025-3-30 13:20
Aggregate Operations,erent ways to find aggregates. For example, we might want to count the number of tournament entries in each individual year, or we might want to find the number of entries in each particular tournament.作者: 哪有黃油 時(shí)間: 2025-3-30 19:35 作者: 母豬 時(shí)間: 2025-3-30 21:59
10樓作者: 自制 時(shí)間: 2025-3-31 01:15
10樓
