因此,在实际生产中,要尽可能利用其他效率相对高的SQL来避免使用Not in Subquery。 虽然通过改写Not in Subquery的SQL,进行低效率的SQL到高效率的SQL过渡,能够避免上面所说的问题。但是这往往建立在我们发现任务执行慢甚至失败,然后排查任务中的SQL,发现"问题"SQL的前提下。那么如何在任务执行前,就"检查"出这样的SQL...
1. 理解SQL错误[42601]的含义 SQL错误代码 [42601] 通常表示语法错误。在你提供的情况下,错误消息明确指出“subquery in from must have an alias”,这意味着在FROM子句中的子查询没有分配别名。 2. 识别出导致错误的子查询部分 要解决这个问题,你需要检查你的SQL查询,并找到在FROM子句中没有别名的子查询。例如...
HIVE SQL 中报错SemanticException Error in parsing 报错SemanticException Error in parsing 是因为误把.写成了, 把a,userid改成a.userid就可以了...hive报错Could not get block locations. Source file “/user/hive/warehouse/xxx hive报错 以及 是因为链接超时了设置set mapred.task.timeout=600000;为10分钟...
In SQL, a Subquery is aquery within a query. Subqueries provide data to the enclosing query. Subqueries can return individual values or a list of records. Subqueries must be enclosed with brackets (). Example # List all suppliers with the number of products they offer. ...
问where not in subquery - SQL Server 2008EN以下SQL语句中的内部查询用于规范化数据库的一部分(code1...
If the operator is EXISTS or NOT EXISTS, the subquery must contain WHERE. If any a field in the subquery is the same as that in the external query, add the table name before the field in the subquery. Precautions The to-be-queried table must exist. If this statement is used to query...
遇到的问题之"数据库编写SQL-》子查询中加入limit报错:This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'" 一、问题 > 1235 - This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery' 二、原因/解决方案 这个错误通常是由于MySQL版本太旧导致的。
报错: .hadoop.hive.ql.parse.ParseException:line 368:18 cannot recognize input near ‘group’ ‘by’ ‘order_phone_num’ in subquery source customer_Flag as ( select order_phone_num, concat_ws('…
Also the SQL "Select * from S_Akte A where A.ID not in (SelectTop(30)AkteID from RW_RECH) " gives me a result which I expect. Is there any way to make the first SQL command work correctly? I get an empty result. This isnot expectedand thereforeincorrect. ...
SQL is dynamic enough to handle queries within queries. These inner queries are called subqueries and they can be used in many different sections of another query. In this video we will use subqueries within a where clause, a join statement, and as a column value. ...