cast varchar to int

MySQL provides us with two types of conversion functions: cast and convert, how can we let go of the ready-made stuff?1 BINARY[(N)]2 CHAR[(N)]3 DATE4 DATETIME5 DECIMAL6Signed[INTEGER]7 Time8UNSIGNED[INTEGER]Example:--use cast to convert varchar to

Original: http://www.2cto.com/database/201310/250880.htmlSQL cast and CONVERT usage detailed   Summary: The following applies only to Mysqlselect {fn CONCAT (CONVERT (User_id,char), user_name)} as Str from T_SYS_ User following this applies only to

In mysql, if I use common data sorting methods, we may not get the expected results, but mysql provides us with the CAST CONVERT function, which can CONVERT numbers accordingly, I used this function to sort Chinese characters in the past. Let's

Mysql varchar sorting CAST, CONVERT function type conversion, varcharconvert When creating a table on your own, you should create a field type as varchar (2). In fact, it should be set as integer (2). But today, we found a Sorting Problem in the

When you build the table, a field type is created as varchar (2), in fact, it should be built as an integer (2), but today in the background to find the problem of sorting, varchar sort has a problem, so how to solve it?Example table structure:

Simple to say about MySQL's varchar sorting problem, a cautionary tale. Sample Table structure: Let's take a look at my table structure   code is as follows copy code Show create table Cardserver G **************

Is today in the background to find a sort of problem. So, there's no way to change it. Here is a brief look at MySQL varchar sorting problem, warning. Sample Table structure:Let's take a look at my table structure The code is as follows

How to Use substring in oracle Database CONVERT (varchar (12), getdate (), 112), substringgetdate SqlserverI often need to perform some time-type field conversions, but I don't quite remember it. So I collected the following

First Reader Network reference The code is as follows Copy Code CONVERT (expr USING transcoding_name) In MySQL, transcoding names are the same as the corresponding character set names. Examples:

MySQL database converts int to varchar for slow query, mysqlvarchar Two slow queries are processed in the last week because the int type cannot be converted to varchar. CREATE TABLE `appstat_day_prototype_201305` (`day_key` date NOT NULL DEFAULT '190