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Label:I used to want to know what the difference was, but it was forgotten because we seldom used a unique key constraint. It was not until a few days ago that my colleague gave me a script to constrain the uniqueness of a field with a unique key constraint. There seems to be a difference, and no big difference found! Actually, it's not much different, just test it out. Use [Demodb] GO CREATE TABLE [dbo].
Generally, we can see that the terms "Index" and "key" are used for exchange, but they are actually different. An index is a physical structure stored in a database. A key is purely a logical concept. The key represents the integrity constraints created to implement business rules. The confusion between indexes and keys is generally caused by the use of indexes in the database to implement integrity constraints. Recommended reading: Automatic Indexing of Oracle primary key constraints Simulation
MP3 is only a type of audio format. However, audio has several important parameters, such as kHz, bit, audio channel, and kbps. the formats are different, and the algorithms are different. Therefore, when the above parameters are the same, the quality of different formats varies greatly. VBR is a kind of dynamic sampling. For more information, see the following d
Comparison of unique constraints and unique indexes in DB2 and Oracle: db2 => connect to sample database connection information database server = db2/NT 10.1.0 SQL authorization id = ADMINIST... local Database alias = sample create table db2admin. test. The field id is null. The following process shows that the unique constraint in db2 does not allow empty column
1. Description of unique constraints on the official website Http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/datainte.htm#CNCPT1642 Uniquekey constraint requires that every value in a column or set of columns beunique. no rows of a table may have duplicate values in a column (the uniquekey) or set of columns (the composite unique key) with a unique
OracleDatabaseUnique ConstraintAndUnique IndexThe difference is what we will introduce in this article. When using TOAD to operate Oracle databases, we will notice four types of constraints when creating constraints: Primary Key, Check, Unique, and Foreign Key, this is no different from the constraints in SQL Server. Besides the general Check constraints, the Check constraints are also used in Oracle for non-empty constraints. That is to say, if a fie
article shows that in the case does not support HTML5, will be flash play, but in support of HTML5 Firefox play MP4, but encountered great difficulty, although the call to Flash, but has been unable to play (but I have always suspected that my Firefox flash has a problem , don't know if it's true). But if you follow Videojs's advice and put in two-format videos, you won't have this problem.In addition to the writing of video also has a special for flash writing, of course, you can also use this
There was no deliberate attempt to understand the difference between a unique constraint and a unique index, except that a unique index is automatically created after the unique constraint has been built, and the corresponding unique index is automatically deleted after the
Recently my wife gave me a death order, let me the computer's "broken speakers" to replace, she really can not endure to listen to music without surround sound, watching movies without overweight bass, play no game stereo sound, singing KTV simply do not sound ... Vulgar speech: "Head can be broken, blood flow, wife orders can not be lost." "Yes, this time must be excellent to complete the task of wife confessed!" Can change the speaker to spend money, if not change the speaker can also bring th
This article focuses on how to capture a single frame of audio data on the Android platform. Before reading this article, it is recommended to read my previous article, "Android Audio Development (1): Fundamentals", because in the audio development process, often involves these basic knowledge, after mastering these important concepts, the development process of
A unique constraint can be used to guarantee that one or more column values are unique when one record is added to the base table. If a unique constraint has been given or defined above,It is not possible for any operation to replace the copied values in these columns. Although unique, system-required indexes are used
To play and record audio on iOS devices, we recommend that you use the avaudioplayer and avaudiorecorder classes in the avfoundation framework. Although its usage is relatively simple, streaming is not supported. This means that before playing the audio, you must wait until the whole audio is loaded to start playing the audio
HTML5 audio function, html5 audioHTML5 audio Functions 1. Web audio Until now, there is still no standard for playing audio on the webpage. Today, most audios are played using plug-ins (such as Flash. However, not all browsers have the same plug-ins. HTML5 specifies a standard method to include
In general, we can see that the terms ldquo; index rdquo; and ldquo; key rdquo; are used for exchange, but these two are actually different. An index is a physical knot stored in a database. In general, we can see that the terms ldquo; index rdquo; and ldquo; key rdquo; are used for exchange, but these two are actually different. An index is a physical knot stored in a database. Generally, we can see that the terms "Index" and "key" are used for exchange, but they are actually different. An
Mongoose: how to solve the problem that unique does not take effect and how to remove the unique restriction, mongooseunique Preface Unique is a member of schema Constraints Verification. Its role is to make the value of a field unique (cannot be repeated) To keep the field unique
This section describes several python audio processing libraries and python audio processing libraries. 1. eyeD3 Search for python mp3 process directly on google. This third-party library is recommended. Let's take a look at the official introduction.About EyeD3 is a Python tool for working with audio files, specifically mp3 files containing ID3 metadata (I. e.
[LeetCode-interview algorithm classic-Java implementation] [063-Unique Paths II (Unique path Question II)], leetcode -- java [063-Unique Paths II (Unique path Problem II )][LeetCode-interview algorithm classic-Java implementation] [directory indexes for all questions]Original question Follow up for "
Usage of the UNIQUE constraints (UNIQUE Constraint) in Oracle, uniqueconstraint Oracle | PL/SQL Unique index (Unique Constraint) Usage1 goal The following example shows how to create, delete, disable, and use uniqueness constraints. 2. What is a uniqueness constraint? A uniqueness constraint refers to the constraint th
The purpose of creating a unique index is not to improve access speed, but to avoid duplication of data. A unique index can have more than one but the value of the indexed column must be unique, and the value of the indexed column allows null values. If you can determine that a data column will contain only values that are different from each other, you should us
Turn from: http://blog.csdn.net/lixiaowei16/article/details/53407010 Audio and video synchronization is related to the most intuitive user experience of multimedia products, audio and video media data transmission and rendering playback of the most basic quality assurance. If the audio and video is not synchronized, it may cause delays, such as cotton, etc. ver
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