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MySQL supports a large number of column types, which can be grouped into 3 categories: numeric types, date and time types, and string (character) types. This section first gives an overview of the available types, summarizes the storage requirements

The Caption property (that is, the caption) of a Field object in an Access database is used to set the caption for the data field. In the normal database design in order to maintain the convenience of maintenance, many developers have the field name

Process Pl/sql is a mainstream application programming language based on Oracle, which is characterized by a combination of SQL statements and procedural development languages to achieve more complex business logic. This article mainly discusses the

server|sqlserver| function 1. String function Length and analytical use DATALENGTH (char_expr) returns the string contains the number of characters, but does not contain the trailing spaces SUBSTRING (expression,start,length) Don't say much, take

Ado DropShadow Property The DropShadow property is intended to add shadow effects to an object. The effect it does looks like leaving the original object out of the page and then displaying the object's projection on the page. Take a look at its

Css The value of a length consists of an optional plus "+" or minus sign "-", followed by a number, and two letters indicating the unit. There is no space in the value of a length, for example, "1.3 em" is not a valid length value, but "1.3em" is

JavaScript does not support multidimensional arrays, but because arrays can contain objects (arrays are also objects), arrays can be nested to implement functions similar to multidimensional arrays. 1. Understanding Arrays An array is a collection

Commonly used check regular expression, need to be difficult to find, the collection of it. Verify Number: ^[0-9]*$Verify the N-bit number: ^\d{n}$Verify at least n digits: ^\d{n,}$Verify the number of m-n bits: ^\d{m,n}$Verify numbers beginning

Grammar | regular A regular expression is a literal pattern consisting of ordinary characters (such as characters A through Z) and special characters (called metacharacters ). This pattern describes one or more strings to be matched when looking

Object Math ObjectProperty LN10 (natural logarithm of 10) PI (3.1415926 ...) Sqrt1_2 (square root of 1/2) Method ABS (x) returns the absolute value of X ACOs (x) returns the arc cosine value of X ASIN (x) returns the arc sin value of

Reference | object | The natural logarithm of the array LN10 10 (approximately equal to 2.302) LOG2E the logarithm of the 2-base e (about 1.442) LOG10E the logarithm of a 10-base e (approximately equal to o.434) Value of Pi∏ (approximately equal to 3

function | date ' Date function Package Datapackage %> '********************** ' Purpose: Convert date to standard date string ' Input: Date ' Output: Date string, such as: 2002-12-22 '********************** Function Getdatestr (ddate) Dim strtmp

Function Many functions in ASP, we should focus on learning functions: function name, function function, function return value and example. 1. Function Array ()Function: Create a number of variablesFormat: Array (list)Parameters: The list is the

Function 24. Function LCase () Function: Change the character of a character type to a small write character. Format: Lcase (String) Parameters: String is the number of string changes Example: Str= "This is lcase!" Response.Write Lcase

Program | Connection Database ' ******* connection Database tree Graph generator ******** '＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ ' Suppose you have established the SQL Server database Unittree and created tables in the library: ' Units (ID Unit ordinal

rss| page |rss Many times when we use the Asp+ database to program a website, when a record is read and other variables are calculated, a null value may result in the program returning an error, if each read statement is followed by a judgment

Program | Vote for the survey to understand the site visitors to the specific issue of the position, we can set up a polling site, site visitors directly choose the answer, the program automatically to all the answers to statistics and

Stored procedure | Stored Procedure 1 This is also the simplest method, with two input parameters and no return value: Set connection = Server.CreateObject ("Adodb.connection") Connection.Open SOMEDSN Connection.Execute "ProcName varvalue1, Varvalue2

/** * 10 into 62 * * @param integer $n 10 binary Value * @return String 62 /function dec62 ($n) { $base =; $index = ' 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ '; $ret = '; for ($t = Floor (log1

  Return, break, and contiue are language constructs, like if statements, but exit is a function.   1.exit function: Output A and terminate the current script outputs a message and terminates the existing scripts. If a piece of text includes