difference between ndf and forward

() |+-----------+----------+-----------+| 12:49:26 | 0 | 12:49:26 |+-----------+----------+-----------+The two values it returns are the same because they represent the time at which the statement started executing. 4.sysdate returns the time, the format and time () function returns the same, but there is a difference. Format: 2013-01-17 13:02:40Mysql> Select Sysdate (), Sleep (5), sysdate ();+---------------------+----------+---------------------+|

Profile The thread class contains the start () and run () methods, what are the differences? This chapter will provide an answer to this. The contents of this chapter include: Description of the difference between start () and run () Example of the difference between start () and run () Start () and run () related source (based on jdk1.7.0_40) Reprint please indicate the source: http://www.cnblogs.com/

Tags: the comparison between make STR is SQL info strong. comNote: M here is not a specific length stored in the database, it was always mistaken for int (3) to store only 3-length numbers, and int (11) would store 11-length numbers, which is a big mistake. In fact, when we choose the type of int, whether it is int (3) or int (11), it is stored in the database is 4 bytes of length, when using int (3) If you enter 10, will default to you storage bit 010, This means that the 3 is the default leng

What is the difference between a SQL Server database and a MySQL database? A lot of friends in the IT industry. For SQL Server database and MySQL database often confuse, think these two kinds of database is the same, otherwise, today we analyze the difference between these two kinds of database:What is the difference between a SQL Server database and a MySQL data

Many CSS beginners in the CSS inline elements and CSS block-level elements, it may be easy to confuse, then, this article will explain to you CSS inline elements and block-level elements of what? and the difference between CSS block-level elements and CSS inline elements. What is the definition of CSS block-level elements in the previous article? What are CSS block-level elements? We introduce the block-level elements of CSS separately, so we won't s

asked me what is the difference between int (10) and int (11), then think is the difference between the length, now look, they are in addition to the storage of a slightly different,There is no difference when we use it. an int (10) can also represent a value of 2147483647 for which int (11) can also be represented.To see the different effects remember to add th

What is the difference between Oracle functions and stored procedures1. The difference between the return value, the function has 1 return values, and the stored procedure is returned by the parameter, can have more or No 2. The difference between the calls, the function can be called directly in the query statement, The stored procedure must be called separately

Label:2014-02-03 Created by BaoxinjianThe difference between Oracle dual-machine/rac/dataguardData Guard is a remote replication technology for Oracle, it has physical and logical points, but in general, it needs a separate system in a remote location, two sets of hardware configurations can be different systems, but the software structure of the two systems are consistent, including the software version, directory storage structure, and data synchron

Tags: decimal ace tle parameter BSP number default data descriptionTwo date Type fields: Start_date,end_date, which calculates the time difference between these two dates (in days, hours, minutes, seconds, milliseconds, respectively): Days: ROUND (To_number (end_date-start_date)) Hours: ROUND (To_number (end_date-start_date) * 24) Minutes: ROUND (To_number (end_date-start_date) * 24 * 60) Seconds: ROUND (To_number (end_date-start_date) * 24 * 60 * 60)

is 0 to 16777215.6. int[(m)] [UNSIGNED] [Zerofill] M default is 11An integer of normal size. The signed range is -2147483648 to 2147483647. The unsigned range is 0 to 4294967295.7.bigint[(m)] [UNSIGNED] [Zerofill] M default is 20A large integer. The signed range is -9223372036854775808 to 9223372036854775807. The unsigned range is 0 to 18446744073709551615.*: The M here represents not the exact length stored in the databaseIn fact, when we choose the type of int, whether it is int (3) or int

MongoDB and MySQL operation comparison table and the difference introduction MySQL and MongoDB are common open source databases, but MySQL is a traditional relational database, MongoDB is a non-relational database, also known as a document database, is a NoSQL database. They each have their own merits, the key is to see where to use. So the SQL (full name structured Query Language) statements that we know are not applicable to MongoDB, becaus

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

. Trigger Information detection: 1. Monobehaviour.ontriggerenter (Collider Collider) when entering trigger 2. Monobehaviour.ontriggerexit (Collider Collider) when exiting Trigger 3. Monobehaviour.ontriggerstay (Collider Collider) when the stay Trigger collision information detects: 1. Monobehaviour.oncollisionenter (Collision collision) when entering Collider 2. Monobehaviour.oncollisionexit (Collision collision) when exiting Collider 3. Monobehaviour.oncollisionstay (Collision collision) when t

This is an Excel (or WPS) extension function that calculates the difference of the station (that is, the length), which reduces the amount of work the engineer can do in the statistical work.This function has a certain universality. Can be used on MS Office and Kingsoft WPS.at the end of this article, we will give you a simple procedure for using this function Excel (or WPS for a more detailed description of the custom functions in here [1] . Copy the

For wait and sleep it would seem to block threads, but they are really a big difference, so here's a little bit of discussion: Difference one, Sleep () is the method inside the thread, and wait () is the method of the object class.This is relatively simple, directly read the code will know: The difference between the sleep () method does not need to be a

Transferred from: http://blog.csdn.net/xiaofei0859/article/details/51145051Both are working on the file, so what's the difference between the two, and how do you choose when you use it?1. Differences The fread is buffered and read without buffering. Fopen is defined in standard C, and open is defined in POSIX. Fread can read a structure. Read in Linux/unix There is no difference between rea

The difference between BASHRC and profileTo understand the difference between BASHRC and profile, first figure out what the interactive shell and non-interactive shell are, and what the login shell and non-login shell are.The interactive mode is where the shell waits for your input and executes the commands you submit. This pattern is called interactive because the shell interacts with the user. This mode i

1. The difference between buffer and cache650) this.width=650; "Src=" Http://s4.51cto.com/wyfs02/M00/8B/64/wKiom1hL2fuxvFDCAAA4AR6R74E921.png-wh_500x0-wm_3 -wmp_4-s_199177087.png the difference between the "title=" buffer and the cache. png "alt=" wkiom1hl2fuxvfdcaaa4ar6r74e921.png-wh_50 "/>The difference between buffer and cache buffer is different from the obje

the difference between Redis and memcachedTags: memcachednosqlphpredistable2012-12-11 08:42 204083 People read Comments ($) Collection report Classification:Product FocusMySQL (1)Reprint Address: http://gnucto.blog.51cto.com/3391516/998509The difference between Redis and memcachedProblems encountered in traditional mysql+ memcached architecturesThe actual MySQL is suitable for massive data storage, throu

There are two ways to calculate the time difference, one is to convert the times to minutes, one to convert the time to hours, the latter to divide so it is unavoidable to generate floating-point numbers, so we choose to convert to minutes to calculate.Title: Calculate their time difference at two points, for example, 1:50 and 3:21Define four variables to save the input timeDefault a time is less than B tim