大约有 40,000 项符合查询结果(耗时:0.0322秒) [XML]

https://stackoverflow.com/ques... 

mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to

I am trying to select data from a MySQL table, but I get one of the following error messages: 31 Answers ...
https://stackoverflow.com/ques... 

Firefox ignores option selected=“selected”

If you change a dropdown and refresh the page, Firefox seems to ignore the selected attribute. 20 Answers ...
https://stackoverflow.com/ques... 

Cast int to varchar

...datatype, there is no varchar datatype that you can cast/convert data to: select CAST(id as CHAR(50)) as col1 from t9; select CONVERT(id, CHAR(50)) as colI1 from t9; See the following SQL — in action — over at SQL Fiddle: /*! Build Schema */ create table t9 (id INT, name VARCHAR(55)); ins...
https://stackoverflow.com/ques... 

How to avoid the “divide by zero” error in SQL?

...rder to avoid a "Division by zero" error we have programmed it like this: Select Case when divisor=0 then null Else dividend / divisor End ,,, But here is a much nicer way of doing it: Select dividend / NULLIF(divisor, 0) ... Now the only problem is to remember the NullIf bit, if I use the "/"...
https://stackoverflow.com/ques... 

Javascript Equivalent to C# LINQ Select

...always add custom methods to the array prototype as well: Array.prototype.select = function(expr){ var arr = this; //do custom stuff return arr.map(expr); //or $.map(expr); }; var ids = this.fruits.select(function(v){ return v.Id; }); An extended version that uses the function ...
https://stackoverflow.com/ques... 

How to remove leading and trailing whitespace in a MySQL field?

...d the use case before using this solution: trim does not work while doing select query This works select replace(name , ' ','') from test; While this doesn't select trim(name) from test; share | ...
https://stackoverflow.com/ques... 

What is the best way to auto-generate INSERT statements for a SQL Server table?

...2008: Right-click on the database and go to Tasks > Generate Scripts. Select the tables (or objects) that you want to generate the script against. Go to Set scripting options tab and click on the Advanced button. In the General category, go to Type of data to script There are 3 options: Schema ...
https://stackoverflow.com/ques... 

How important is the order of columns in indexes?

I've heard that you should put columns that will be the most selective at the beginning of the index declaration. Example: ...
https://stackoverflow.com/ques... 

Fastest Way to Find Distance Between Two Lat/Long Points

...ate a SPATIAL index on these points Use MBRContains() to find the values: SELECT * FROM table WHERE MBRContains(LineFromText(CONCAT( '(' , @lon + 10 / ( 111.1 / cos(RADIANS(@lon))) , ' ' , @lat + 10 / 111.1 , ',' , @lon - 10 / ( 111.1 / cos(RADI...
https://stackoverflow.com/ques... 

LINQ Using Max() to select a single row

I'm using LINQ on an IQueryable returned from NHibernate and I need to select the row with the maximum value(s) in a couple of fields. ...