CONCAT function concatenates 2 or more strings into one string. Syntax CONCAT(string1, string2, ...) Quick Example SELECT CONCAT('A','B'); Null If any value is NULL, the result is NULL Last Update: MySQL 5.6 Related Functionality in MySQL Rel
To concatenate strings, use the the CONCAT() function: update table set index=concat('1.0', right(index, 1)) where index like '1.%'; A more generic statement might be: update table set index=concat(floor(index), '.0', right(index, 1)); or: update table set index=floor(...
GROUP _CONCAT function is a GROUP BY aggregate function that allows you to concatenate column values from multiple rows into a single field. It returns a string if the set group contains one or no-null column value and returns a NULL value if none can be found. This tutorial will teach y...
Now, we have to concatenate the column values such that the resultant string will have the strings in the format Word “word column string” means that “meaning string”. We can use the Concat function to do so in the following query statement: SELECT CONCAT('Word ', word, ' means that...
mysql> SELECT TRUE, true, FALSE, false; +---+---+---+---+ | TRUE | TRUE | FALSE | FALSE | +---+---+---+---+ | 1 | 1 | 0 | 0 | +---+---+---+---+ 1 row in set (0.03 sec) NULL Values NULL 代表数据为空,大小写不敏感,与 \N(大小写敏感)同义。 需要注意...
Summary: in this tutorial, you will learn how to use the MySQL GROUP_CONCAT function to concatenate strings from a group of values with various options. Introduction to MySQL GROUP_CONCAT function The GROUP_CONCAT function concatenates strings from a group into one string with various options. ...
不支持INSERT ... SELECT(版本>14.4支持) 不支持index_hint 不支持HANDLER/DO管理SQL不支持ANALYZE/CHECK/CHECKSUM/OPTIMIZE/REPAIR TABLE,需要用透传语法 不支持CACHE INDEX 不支持FLUSH 不支持KILL 不支持LOAD INDEX INTO CACHE 不支持RESET 不支持SHUTDOWN 不支持SHOW BINARY LOGS/BINLOG EVENTS 不支持SHOW WARNINGS...
mysql>selectCHAR(77,121,83,81,'76'); ->'MySQL' mysql>selectCHAR(77,77.3,'77.3'); ->'MMM' 5.CONCAT/CONCAT_WS CONCAT(str1,str2,...) 返回来自于参数连结的字符串。如果任何参数是NULL,返回NULL。可以有超过2个的参数。一个数字参数被变换为等价的字符串形式。
MySQL所有函数及操作符 参考:Function and Operator Reference
ExampleIn this example, we are using the CONCAT() function to concatenate two strings, 'tutorials' and 'point' −SELECT CONCAT('tutorials', 'point'); Following is the output of the above code −CONCAT('tutorials', 'point') tutorialspoint...