mysql> Select player_id,distinct(task_id) from task; ERROR 1064 (42000): You havean error in your SQL syntax; check the manual that corresponds to your MySQLserver version for the right syntax to use near 'disti nct(task_id) from task' atline 1 现在把distinct放在开头 mysql> Select dis...
GROUP BY可以给出单列结果,如果这正是您需要的。 -- filter all results SELECT DISTINCT film_id, rental_rate FROM film; -- filter on rental_rate SELECT film_id, rental_rate FROM film GROUP BY rental_rate; -- syntax error SELECT film_id, DISTINCT(rental_rate) FROM film; 本站已为你智能检...
-- 会提示错误,因为distinct必须放在开头 /*[SQL]SELECT id, DISTINCT NAME FROM table_a; [Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DISTINCT NAME FROM table_a' at line 3 */ 5.其...
Here, the SQL command selects only the unique values of age from theCustomerstable. Syntax of SQL SELECT DISTINCT SELECTDISTINCTcolumn1, column2 ...FROMtable; Here, column1, column2, ...are the table columns tableis table name from where we retrieve the distinct columns Example: SQL SELECT...
多列去重则是根据指定的去重列信息进行,即只有所有指定的列信息都相同...the manual that corresponds to your MySQL server version for the right syntax to use near 'distinct...MySQL不同版本sql_mode默认值可能是不同的,因此在数据库升级配合的应用迁移过程中,尤其要注意像only_full_group_by这种校验规则的...
SELECT `orig`.`SONG TITLE`,`orig`.`PUBLISHER`;Syntax error (missing operator) in query expression 'COUNT(DISTIN 浏览3提问于2014-11-01得票数 1 4回答 将多个计数查询合并为一个查询 、 在SQL中,我有一组查询,它们返回具有不同条件的不同表中的计数值,如下所示FROM Table ASELECT COUNT(DISTINCT ...
not exists:与exists相反,括号内子查询sql语句返回结果为空(即:sql不返回的结果为真),子查询的结果为空则条件成立,执行主slq,否则不执行。 总结:exists 和not exists语句强调是否返回结果集,不要求知道返回什么,与in的区别就是,in只能返回一个字段值,exists允许返回多个字段 提醒:文章中提供了exists和not exists的...
Syntax SELECTDISTINCTcolumn1,column2, ... FROMtable_name; Demo Database Below is a selection from theCustomerstable used in the examples: CustomerIDCustomerNameContactNameAddressCityPostalCodeCountry 1 Alfreds FutterkisteMaria AndersObere Str. 57Berlin12209Germany ...
COUNT() with the DISTINCT clause removes duplicate rows of the same data in the result set. It also removes ‘NULL’ values in the result set. The correct syntax for using COUNT(DISTINCT) is: SELECT COUNT(DISTINCT Column1) FROM Table; The distinct count will be based off the column in...
ALL, DISTINCT, DISTINCTROW, TOP Predicates Specifies records selected with SQL queries. Syntax SELECT [ALL | DISTINCT | DISTINCTROW | [TOPn[PERCENT]]] FROMtable A SELECT statement containing these predicates has the following parts: