Hello everybody, I have a query to select players from one table where the player is not in another two tables, but for some reason sometimes it returns a player that actually is in one of the 2 tables. Here is the query: SELECT jugadores.* FROM jugadores LEFT JOIN usuarios...
NOT IN是 MySQL 中的一个子查询操作符,用于筛选出不在某个指定集合中的记录。它通常与SELECT语句一起使用,用于过滤掉满足特定条件的记录。 语法 代码语言:txt 复制 SELECT column_name(s) FROM table_name WHERE column_name NOT IN (value1, value2, ..., valuen); ...
步骤1:使用not exists替代not in 首先,我们可以尝试使用not exists替代not in来进行查询。下面是一个示例代码: SELECTcolumn1,column2,...FROMtable_nameWHERENOTEXISTS(SELECT*FROManother_tableWHEREcondition); 1. 2. 3. 这段代码会查询table_name表中不在another_table表中满足条件的记录。使用not exists的好处...
SELECT * FROM table_name WHERE column_name NOT IN (value1, value2, value3); 复制代码 使用子查询: SELECT * FROM table_name WHERE column_name NOT IN (SELECT column_name FROM another_table WHERE condition); 复制代码 通过以上两种方法,您可以查询不在某个范围的数据。希望对您有帮助! 0 赞 ...
select count(*) from tab2,tab1 执行时间26.09秒 1. 如果有3个以上的表连接查询, 那就需要选择交叉表(intersection table)作为基础表, 交叉表是指那个被其他表所引用的表. 例如: EMP表描述了LOCATION表和CATEGORY表的交集. SELECT * FROM LOCATION L , ...
3.SELECT*FROMCallLEFTOUTERJOINPhone_BookON(Call.phone_number=Phone_book.phone_number)WHEREPhone_book.phone_numberISNULL 见https://stackoverflow.com/questions/367863/sql-find-records-from-one-table-which-dont-exist-in-another
当今的数据库管理系统在数据存储和检索方面起着关键作用,而MySQL作为最受欢迎的开源关系型数据库管理系统之一,提供了许多强大的功能。...在MySQL中,INSERT INTO SELECT语法是一种非常有用的功能,可以将查询结果直接插入到目标表中。本文将介绍MySQL中的INSERT INTO SELE
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mysql>selectremaining_delayfromperformance_schema.replication_applier_status;+---+|remaining_delay|+---+|NULL|+---+1rowinset(0.00sec) mysql>-- 主mysql>droptabletest.t3; Query OK,0rowsaffected (0.02sec) mysql>-- 从mysql>selectremaining...
Date: June 15, 2005 03:25AM Not sure what this has to do with "Transactions" - other than the name of your table ;) But anyway, this is easily achieved with a LEFT JOIN. If you know how LEFT JOIN works (selects all rows from the "left" (first listed) table, along with any ...