我有一个查询,它将获取所有产品名称,并将名称连接到1列。但我想不出该怎么做。以下是查询。SELECT package_id, (
SELECT c.product_name FROM tbl_product c WHERE c.product_id IN我不确定我是否正确地使用了GROUP_CONCAT。
问题是,如果内部查询返回null/empty,那么外部查询将检索表中的所有值。customer_ref AS customer_Ref, pname AS company_name WHERE t.pname LIKE CONCATcustomer_ref = '1-31898332401005' )
SELECT tcs.tutor_id AS tid, tcs.category_id AS cid, tcs.subject_id AS sid, GROUP_CONCAT( DISTINCT s.subjectst.tutor_code AS tcode, DATE_FORMAT(t.registration_date, '%b %D, %Y') AS date, t.qualification,WHERE s.subjects LIKE '%business%'
我有两个表: products(product_id,date)和sex(product_id,sex)。我还希望从性别表中删除所有包含product_id的行,这些行包含在我要从products表中删除的行之一中。(这可能会删除每个product_id的多行。)DECLARE @recordsToDelete AS TABLE();
INSERT INTO @recordsToDelete( produc