ON u.id = p.uid ORDER BY p.id DESC I also tried with a standard CONCAT() instead of the CONCAT_WS(), without change. If you want, I can give you my testbed information so you can log in and try for yourself. Sorry, you can't reply to this topic. It has been closed.
RETURNNUMBERISBEGINRETURNVALUE:=CURR_STR;RETURNODCICONST.SUCCESS;END;MEMBERFUNCTIONODCIAGGREGATEMERGE(SELFINOUTWM_CONCAT_IMPL_CLOB_NULL_LHR,SCTX2INWM_CONCAT_IMPL_CLOB_NULL_LHR)RETURNNUMBERISBEGINIF(SCTX2.CURR_STRISNOTNULL)THENSELF.CURR_STR:=SELF.CURR_STR||SCTX2.CURR_STR;ENDIF;RETURNODCICONST.SUCC...
CONCAT() returns NULL if any argument is NULL. Example1: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECT CONCAT( t.id, ',', t.NAME, ',', t.score ) AS info FROM tt2 t 2. CONCAT_WS() API: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CONCAT_WS(separator,str1,str...
It returns NULL if there are no non-NULL values. The full syntax is as follows: WEBJ2EE 2021/09/24 2.1K0 Mysql 函数concat、concat_ws和group_concat 数据库云数据库 SQL Server云数据库 MySQL concat()函数是将多个字符串组合在一起,形成一个大的字符串;如果连接的字符串中存在一个为NULL,则输出的...
DROP TABLE IF EXISTS `lgs_operation_task_rules`; CREATE TABLE `lgs_operation_task_rules` ( `ID` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键', `site_id` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '站点id', ...
select wm_concat(',', name) from table_name;语句中,如果table_name为空集合,该语句返回NULL值。 示例数据 为便于理解各函数的使用方法,本文为您提供源数据,基于源数据提供函数相关示例。创建表emp,并添加数据,命令示例如下: createtableifnotexistsemp (empnobigint, ename string, job string, mgrbigint, ...
If any argument is NULL, the result of the CONCAT() function will also be NULL. Binary and Nonbinary Strings: The function returns a nonbinary string if all arguments are nonbinary. It returns a binary string if any of the arguments are binary. ...
32312 IF NOT EXISTS*/`test-day` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;USE `test-day`;/*Table structure for table `day_sell` */DROP TABLE IF EXISTS `day_sell`;CREATE TABLE `day_sell` (`id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT '主键',`name` varchar(30) DEFAULT NULL...
The method concatenates each object in values; it does not add any delimiters. To specify a delimiter between each member of values, call the Join(String, IEnumerable<String>) method. An Empty string is used in place of any null element in values. If values is an empty IEnumerable(Of Stri...
1.1 将字符的数字转成数字,比如'0'转成0可以直接用加法来实现 例如:将test表中的 t 进行排序,可t的定义为varchar,可以这样解决 select * from test order by (t+0) 1.2在进行ifnull处理时,比如 ifnull(a/b,'0') 这样就会导致 a/b成了字符串,因此需要把'0'改成0,即可解决此困扰 1.3 比较数字和varc...