SQL SELECT TOP 1是一种用于从数据库中检索数据的SQL查询语句。它用于返回满足特定条件的第一行数据。 概念: - SQL:结构化查询语言(Structured Query Langua...
1. 对select的结果没有任何条件进行select,顺序是怎么样? 对于查询结果集直接进行select查询,特别是已排序的结果集,会改变数据的顺序。 query 1: 代码语言:javascript 复制 id page_id addtime121155840885211115584025901011558399412811558399247931558349702711558349140311558349079541558348372631558348361421558348351211558348337111558342663 qu...
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queryWrapper取前十条数据可以用queryWrapper 构造器来获取。完整获取代码如下：OverridepublicListgetItems(Stringtype)returnthis.list(newLambdaQueryWrapper().eq(false,DictItem::getTypeValue,type).orderByAs (DictItem::getPriority).last("limit0,1"));} PL/SQL的流程控制语句,包括如下三类:l 控制语...
The following SQL statement shows the equivalent example for Oracle: Example SELECT*FROMCustomers ORDERBYCustomerNameDESC FETCHFIRST3ROWS ONLY; Exercise? What would the following query do in SQL Server? SELECT TOP 5 * FROM Customers; Select the first 5 records from the Customers table ...
where ddiary0_.diary_id<? and ddiary0_.user_id=? order by ddiary0_.diary_id desc1068481ncom.alibaba.druid.sql.parser.ParserException: syntax error, error in :' top 1 ddiary0_.diary_id as diary_i',expect LITERAL_INT, actual LITERAL_INT top ...
[ ; ]<select_criteria>::=[TOP(top_expression) ] [ALL|DISTINCT] { * |column_name| expression } [ , ...n ] [FROM{table_source} [ , ...n ] ] [WHERE<search_condition>] [GROUPBY<group_by_clause>] [HAVING<search_condition>] [ORDERBY<order_by_expression>] [OPTION(<query_option>...
[Model Name].children, 10, [Measures].[Reseller Sales Amount])' // Preferred10Products set removed for clarity select {[Measures].[Reseller Sales Amount], [Measures].[Discount Amount], [Measures].[PCT Discount]} on 0, Top10SellingProducts on 1 from [Adventure Works] where [Product].[...
Query 取樣查詢 SELECT 設定作業 SORT BY 子句 SQL 管線作業 Star 子句 資料表值函數 表格參考 UNPIVOT 子句 WATERMARK 子句 WHERE 子句 WINDOW 子句 WINDOW 框架子句 ANALYZE TABLE CACHE TABLE CLEAR CACHE REFRESH FUNCTION REFRESH TABLE REFRESH UNCACHE TABLE ...
sql select top N 语句是一个非常重要的语句, 在实现分页查询中是不可或缺的. 由于分页查询通常涉及含有大量记录的表, 并且是为大量用户分享的任务,因此,对其进行优化是很有意义的。 实现sql top N 的功能有几种变种: 1. set rowcount @n; select ... order by somefields ...