select top(1) with ties matter_uno, PART_CAT_CODE, EFF_DATE, EMPL_UNO from TBM_CLMAT_PART where MATTER_UNO = 11275 and PART_CAT_CODE = 'BILL' order by eff_date desc Note: Most of the time, only 1 row is returned by this subquery, but sometimes, more than 1 row can be return...
SQL/MySQL: SELECT sum() with JOIN VS SELECT with subselect/subquery 重写嵌套的SELECT as INNER JOIN MySQL 缺少INNER JOIN ON子句的JPA和Hibernate SQL join:where子句与on子句 INNER JOIN - select more row错误的结果 如何在update语句中添加inner join子句 ...
Example: SQL SELECT with WHERE Let's look at another example. -- select age and country columns from customers table where the country is 'USA'SELECTage, countryFROMCustomersWHEREcountry ='USA'; Run Code Here, the SQL command selects theageandcountrycolumns of all the customers whosecountryis...
withxinxias(select incode,fname from tbSpXinXi where fname like'%茶'),kcas(select*from tbSpKc where1=1)select*from xinxi a,kc b where a.incode=b.incode 3. 如果With As的表达式名称与某个数据表或视图重名,则紧跟在该With As后面的SQL语句使用的仍然是With As的名称,当然,后面的SQL语句使用的...
1. WITH cte (col1, col2) AS 2. ( 3. SELECT 1, 2 4. UNION ALL 5. SELECT 3, 4 6. ) 7. SELECT col1, col2 FROM cte; 1. 2. 3. 4. 5. 6. 7. 列表中的名称数量必须与结果集中的列数相同。 ● 否则,列名来自 AS (subquery) 部分的第一个 SELECT 的选择列表: ...
Full Text Search - WITH QUERY EXPANSION 我们虽然只指定了'SQL'作为关键词,但最终结果也显示了包含'MySQL'的结果(查询扩展下认为它们是有强关联关系的)。 1.3 数值处理函数 Numeric Functions 1.4 日期和时间处理函数 Date and Time Functions 2. 子查询 2.1 什么是子查询 子查询(Subquery)是指嵌套在其它查询中...
一.SELECT语句基本语法 1.Select语句主要是从数据库中检索行,并允许从一个或多个表中选择一个或多个行或列。select语句的基本语法如下: 2.Select语句的参数及说明 二.指定公用表表达式 1.WITH子句用于指定临时命名的结果集,这些结果集称为公用表表达式(CTE)。该表达式源自简单查询,并且在单条SELECT、INSERT、UPDATE...
SQL优化案例-使用with as优化Subquery Unnesting(七) 使用no_unnest hint可以让执行计划产生filter,即不展开,但一般情况下使用unnest hint无法消除filter。 如下SQL,找出库中非唯一索引,那么大家可能会这么写SQL: SELECTSEGMENT_NAME,SUM(BYTES/1024/1024) mFROMDBA_SEGMENTSWHERESEGMENT_NAMENOTIN(selectindex_namefrom...
4 select语句中的表连接 当select语句中涉及到多表查询结果时,就会用到表连接操作。 mysql>helpjointable_factor: tbl_name [PARTITION(partition_names)] [[AS] alias] [index_hint_list]|table_subquery [AS] alias [(col_list)]|( table_references ) ...
In many cases, EXISTS is better because it requires you to specify a join condition, which can invoke an INDEX scan. However, IN is often better if the results of the subquery are very small. You usually want to run the query that returns the smaller set of results first. ...