MySQL 如何在mysql中连接整数（整数与整数）和varchar（varchar与varchar）等数据类型？
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How to concat datatypes like integers(integer with integer) & varchar(varchar with varchar) in mysql?
提问by Rachel
How can we concat
我们如何连接
- integers with integers
- varchar with varchar
- int with varchar
- 整数与整数
- varchar 与 varchar
- 带 varchar 的 int
in MySQL ?
在 MySQL 中？
回答by nickf
Use CONCAT
用 CONCAT
http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_concat
http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_concat
SELECT CONCAT(1, 2);
-- "12"
SELECT CONCAT('foo', 'bar');
-- "foobar"
SELECT CONCAT(1, 'bar');
-- "1bar"
回答by MrM
if the arguments include any binary strings, the result is a binary string. A numeric argument is converted to its equivalent binary string form; if you want to avoid that, you can use an explicit type cast, as in this example:
如果参数包含任何二进制字符串，则结果为二进制字符串。数字参数被转换为其等效的二进制字符串形式；如果要避免这种情况，可以使用显式类型转换，如下例所示：
SELECT CONCAT(CAST(int_col AS CHAR), char_col);
回答by user4702237
For two columns concatenation name: CHAR and no: int
对于两列串联名称：CHAR 和 no：int
PIG syntax is CONCAT(name,(CHARARRAY)no);
PIG 语法是 CONCAT(name,(CHARARRAY)no);
