selectt1.ZFJGSLas数量,trunc(1.0*(selectITEM_VALUEfromT_WSTB_YJBKBYSJYQKwhereRECORD_YEAR=(to_char(sysdate,'yyyy')-2)andFIRST_NUM='2'andSECOND_NUM='2')/(selectITEM_VALUEfromT_WSTB_YJBKBYSJYQKwhereRECORD_YEAR=(to_char(sysdate,'yyyy')-2)andFIRST_NUM='2'andSECOND_NUM='1')*100,2)as...
Hi to all,It is good .But I am getting error at where condition.Why result value is not initalize to N.select * from emp awhere n = (select count(distinct(b.salary)) from emp b where a.salary > b.salary)plz clarify my doubt.why it is giving error.plz reply to my mail.bye, ...
具有多个条件的Oracle SQL join子查询 在单个查询中更新具有不同值的多个行 - MySQL 相关·内容 文章(0) 问答(9999+) 视频(0) 沙龙(0) 1回答 具有多个行值的子查询select 、 所以我有这个查询selectoldvalue, newvalue from(select'a' as oldvalue, 'b' as newvalue) as N 现在的问题是,当我想在列...
SELECT 语句还可以嵌入各种指令或*提示*,可用于控制给定查询的处理方式,例如,联接提示(如强制执行联接类型(合并或哈希联接)的JTYPE)。 有关使用 Vertica 提示的详细信息,请参阅提示。 参数 ATepoch 返回指定时期的数据,其中epoch为以下几项之一: EPOCH LATEST:返回数据直到当前时期(但不包括当前时期)。结果集包括来...
Aclause(子句)is a part of a SQL statement(Select语句的一个组成部分) ——for example,SELECT emplovee_id, last_name, and so on Astatement(语句)is a combination(组合)of two or more clauses(Select语句是两个或者多个子句的组合) ——for example,SELECT * FROM employees(SELECT *叫一个子句,FR...
SQL Sub SelectX2() Dim dbs As Database, rst As Recordset ' Modify this line to include the path to Northwind ' on your computer.Setdbs = OpenDatabase("Northwind.mdb")' Count the number of records with a PostalCode 'valueandreturnthe totalinthe Tally field.Setrst = dbs.OpenRecordset("...
Learn the SQL SELECT statement to retrieve data from your database efficiently. Explore examples and syntax to master SQL queries.
Example 2: Using the OFFSET Value In some cases, we may wish to skip or omit a specific number of rows. For example, suppose we wish to retrieve only five elements, but we want to start at position 20. We can use the OFFSET parameter which allows us to tell the LIMIT clause at whi...
SQL PlaygroundCopy SELECT asset_id, asset_type, asset_desc, SUM(asset_value) FROM assets GROUP BY asset_id, asset_type, asset_desc; SELECT asset_id, asset_type, asset_desc, SUM(asset_value) FROM assets GROUP BY ALL; +---+---+---+---+ | asset_id | asset_type | asset_desc...
You are using a key with low cardinality (many rows match the key value) through another column. In this case, MySQL assumes that by using the key it probably will do many key lookups and that a table scan would be faster.(不符合当前查询场景) ...