3)Select replace (' abcttabchhabc ', ' abc ', ' 123 ')Back to 123tt123hh123Using string expressions3 Replace all string tables that appear in string expression 1-Up2 of matches. Returns a new string2. Date and Time functionsFunction nameParameter Example DescriptionDATEADD (date part, number, date)Select DATEADD (year,45, ' 1990-12-11 ')Back to 2035-12-11 00:00:00.000Select DATEADD (month,45, ' 1990-12-11
values less THAN (' 1980 -01-01 '),
PARTITION D values less THAN (' 1990-01-01 '),
PARTITION e values less THAN
);
1. Insert test data
INSERT into the members (id,joined) VALUES (1, ' 1950-01-01 '), (1, ' 1960-01-01 '), (1, ' 1980-01-01 '), (1, ' 1990-01-01 ');
2. Query partition data distribution
SELECT Partition_name,partition_method,partition_expression,partition_description,ta
) return BCreturn substringReplace (String expression 1, string-expression 2, string-expression 3)Select replace (' abcttabchhabc ', ' abc ', ' 123 ')Back to 123tt123hh123Using string expressions3 Replace all string tables that appear in string expression 1-Up2 of matches. Returns a new string2. Date and Time functionsFunction nameParameter Example DescriptionDATEADD (date part, number, date)Select DATEADD (year,45, ' 1990-12-11 ')Back to 2035-12-11 0
) return BCreturn substringReplace (String expression 1, string-expression 2, string-expression 3)Select replace (' abcttabchhabc ', ' abc ', ' 123 ')Back to 123tt123hh123Using string expressions3 Replace all string tables that appear in string expression 1-Up2 of matches. Returns a new string2. Date and Time functionsFunction nameParameter Example DescriptionDATEADD (date part, number, date)Select DATEADD (year,45, ' 1990-12-11 ')Back to 2035-12-11 0
string substring (string expression, start position, length) Select substring (' abcdef ', 2,2) return BC return substring Replace (String expression 1, string-expression 2, string-expression 3) Select replace (' abcttabchhabc ', ' abc ', ' 123 ') Back to 123tt123hh123 Using string expressions 3 Replace all string tables that appear in string expression 1 -Up 2 of matches. Returns a new string 2. Date and Time functions Function name Parameter Example Description DATEADD (date part, number, dat
not preserved by default
Stuff
(string expression 1, start position, length, string expression 2)
Select Stuff (' abcdef ', 2, 2, ' 123 ')Back to A123def
Deletes a specified length of character at the specified beginning in string expression 1, and inserts a string expression 2 at the beginning of the specified position. Returns a new string
Substring
(string expression, start position, length)
Select substring (' abcdef ', 2,2) return BC
) return BCreturn substringReplace (String expression 1, string-expression 2, string-expression 3)Select replace (' abcttabchhabc ', ' abc ', ' 123 ')Back to 123tt123hh123Using string expressions3 Replace all string tables that appear in string expression 1-Up2 of matches. Returns a new string2. Date and Time functionsFunction nameParameter Example DescriptionDATEADD (date part, number, date)Select DATEADD (year,45, ' 1990-12-11 ')Back to 2035-12-11 0
In the study of Liaoche predecessors of the JavaScript tutorial, encountered some points needing attention, so as a study notes listed, remind yourself to notice!If you have the need, welcome to visit the previous blog https://www.liaoxuefeng.com/ study.
To bind a function in an object, we call this function a method of this object.In the previous study, the object is defined as follows:var xiaoming = { ' xiaoming ', 1990};If we bind a fun
Example: 1 //Create a User data table and define a db jsondb alias
2 vardata = [{username: ' Zhang San ', Sex: ' Male ', birthday:{year:2000,month:6,day:18}},{username: ' Li Hong ', Sex: ' Female ', birthday:{year:1986, Month:9,day:22}}]; 3 //The following methods can get aliases in two ways, one from the Init method (recommended), and one to get the return value of the Jsondb () method
4 //The alias operation data created by the Init () method will be used later in the example
5 varJDB = jsond
OriginalA method that binds a function in an object called this object.In JavaScript, the definition of an object is this:var xiaoming = { ' xiaoming ', 1990};However, if we xiaoming bind a function, we can do more things. For example, write a age() method that returns xiaoming the age:var xiaoming = { ' xiaoming ', 1990, function () { var New Date (). getFullYear (); return
A simple question puzzles me for a long time $ nian = 1990; $ a = ($ nian-1); $ B = ($ nian + 1); $ query = quot; SELECT * FROM 'final' WHERE 'writedate' lt; '$ B' and 'a simple question that puzzles me for a long time
$ Nian = 1990;
$ A = ($ nian-1 );
$ B = ($ nian + 1 );
$ Query = "SELECT * FROM 'final' WHERE 'writedate' $ Result = mysql_query ("$ query ");
$ Row = mysql_fetch_array ($ result );
Print_
语法冲突,所以要改为:// OK:x = ({foo:x})ThisThe arrow function appears to be a shorthand for anonymous functions, but in fact, there is an obvious difference between an arrow function and an anonymous function: The lexical scope inside the arrow function this is determined by the context.Looking back at the previous example, this The following example does not get the expected result due to the JavaScript function's error handling of the binding: var obj = {birth: 1
Arrow functionsThe ES6 standard adds a new function: arrow function.x => x * x相当于:function (x) { return x * x;}箭头函数相当于匿名函数,并且简化了函数定义。箭头函数有两种格式,一种像上面的,只包含一个表达式,连{ ... }和return都省略掉了。还有一种可以包含多条语句,这时候就不能省略{ ... }和return:x => { if (x > 0) { return x * x; } else { return - x * x; }}If the arguments are not one, you need to () enclose them in parentheses:// 两个参数:(x, y) => x * x + y * y// 无参数:() => 3.14// 可变参数:(x, y, ...rest) => { var i, sum = x + y; for (i=0; ireturn sum;}I
function body, change to:// ok:x => ({ foo: x }) ThisThe arrow function appears to be a shorthand for anonymous functions, but in fact, there is an obvious difference between an arrow function and an anonymous function: the lexical scope inside the arrow function this is determined by the context .Looking back at the previous example, this The following example does not get the expected result due to the JavaScript function's error handling of the binding:var obj = { birth:
three properties:buildDate({ year: 2017, month: 1, day: 1 });// 2017-12-31T16:00:00.000Z (UTC)You can also pass in hour , minute and second properties:buildDate({ year: 2018, month: 1, day: 1, hour: 20, minute: 15 });// 2018-01-01T12:15:00.000Z (UTC)Using a deconstructed assignment can reduce the amount of code, but it needs to work correctly in a modern browser that supports the ES6 deconstruction assignment feature. Currently, browsers that support deconstruction assignments include Chrome,fi
Safari/537.36Content-Type: application/x-www-form-urlencodedReferer: http: // 192.168.56.188: 8000/reg.htmlAccept-Encoding: gzip, deflate, sdchAccept-Language: zh-CN, zh; q = 0.8, en; q = 0.6, zh-TW; q = 0.4User = simba psw = 1990 repsw = 1990 sex = nan tech = java country = cn
Note: name = value in the form, separated.
Looking back at the code, we just sent the data body submitted by the browser ba
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