- correlated subquery:反之则是相关子查询,如SELECT a.* FROM a WHERE EXISTS (SELECT * FROM b WHERE b.id = a.id)。 c. 按子查询所在的位置分类: - In search_condition:在查询条件中的子查询,比如上文语法图中的所有subquery。 - In FROM clause:在FROM子句中的子查询,又称派生表,如SELECT * FROM...
p.amount -> FROM actors_s_pg spg -> INNER JOIN inventory i -> ON i.film_id = spg.film_id -> INNER JOIN rental r -> ON i.inventory_id = r.inventory_id -> INNER JOIN payment p -> ON r.rental_id = p.rental_id -> ) -- end of With clause -> SELECT spg_rev.first_name...
1) Usually, a subquery should return only one record, but sometimes it can also return multiple records when used with operatorsLIKE IN, NOT IN in the where clause. The query syntax would be like, SELECT first_name, last_name, subject ...
注意在这个例子中,t1表虽然并未在subquery的from clause所指出但是却被subquery中的where clause所引用,t1表只存在于outer query语句中,如果你直接执行这个隔离的subquery,你将由于无法找到t1表而出错。 和他们的non-correlated subquery例子,correlated subquery不允许在from clause中出现。这个关键规则,在mysql refman文档...
FROM子查询指的是将一个SELECT语句作为另一个SELECT语句的FROM子句中的一部分,用于产生虚拟表,以便与另一个表联接。它可以用于复杂的查询,例如从多个表中选择数据和使用聚合函数。常见的用法包括生成汇总报告、分析和比较数据 SELECT tb_alias.col1,... FROM (SELECT clause) AS tb_alias WHERE Clause; ...
SELECT cno,cname,count(sno),MAX(sno) FROM tbl_student_class GROUP BY cno; 执行报错了 [Err] 1055 - Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.tbl_student_class.cname' which is not functionally dependent on columns in GROUP BY clause; ...
rewriteExprs(rewriter, analyzer_); for (TableRef ref: fromClause_.getTableRefs()) ref.rewriteExprs(rewriter, analyzer_); if (whereClause_ != null) { whereClause_ = rewriter.rewrite(whereClause_, analyzer_); // Also rewrite exprs in the statements of subqueries. List<Subquery> subqueryExprs...
Use the EXISTS predicate (with the optional NOT reserved word) in true/false comparisons to determine whether the subquery returns any records. You can also use table name aliases in a subquery to refer to tables listed in aFROMclause outside the subquery. The following example ...
派生表是一个表达式,在查询 FROM 子句范围内生成一个表。例如,SELECT 语句 FROM 子句中的子查询是派生表: 1. SELECT ... FROM (subquery) [AS] tbl_name ... 1. JSON_TABLE() 函数生成一个表,并提供另一种创建派生表的方法: 1. SELECT * FROM JSON_TABLE(arg_list) [AS] tbl_name ... ...
select * from table_view; MaxCompute 1.0不会报错,而MaxCompute 2.0会报如下错误信息: FAILED: ODPS-0130071:[1,15] Semantic analysis exception - while resolving view xdj.xdj_view_limit - ORDER BY must be used with a LIMIT clause generated.column.name.multi.window 说明:使用自动生成的alias的问题。