Solution #1: My first thought was to unpivot these columns and use max function to get the latest date for each row. Since you cannot easily take the max value of multiple columns in a table, we can use the unpivot function to accomplish this. To include all NULL ...
Sometimes it’s necessary to find the maximum or minimum value from different columns in a table of the same data type. For example we have a table and three of its columns are of DATETIME type: UpdateByApp1Date, UpdateByApp2Date, UpdateByApp3Date. We want to retrieve data from the t...
C# Linq Group By on multiple columns C# LINQ List<KeyValuePair<string, KeyValuePair<int, int>>> Group by to List<KeyValuePair<string, List<KeyValuePair<int, int>>> C# LINQ one condition, return multiple columns and rows C# LINQ order by not working for a SQL table with a primary ke...
When you use the MAX function with a GROUP BY list, it means you want to find the maximum value within each group. Suppose, for example, you have an employees table with three columns: employee_id, department_id, salary. Let’s say it contains this data: employee_id department_id salar...
SQL Server Max Value of the Sum of Multiple ColumnsYou can add a row_number to your select in...
IdentityValueKeyOption IfStatement IgnoreDupKeyIndexOption IIfCall ImportanceParameterType IndexDefinition IndexExpressionOption IndexOption IndexOptionKind IndexStatement IndexStateOption IndexTableHint IndexType IndexTypeKind InlineDerivedTable InlineResultSetDefinition InPredicate InsertBu...
Subclause 6.28, "<numeric value function>": <max cardinality expression> ::= ARRAY_MAX_CARDINALITY <left paren> <array value expression> <right paren> ... Conformance Rules: Without Feature S403, "ARRAY_MAX_CARDINALITY", conforming SQL language shall not contain <max cardinality expres...
lower bound/ upper bound 可以是具体的timestamp/scn, 也可以是关键字minvalue/maxvalue. 这些关键字让Oracle去找到所有的versions, 当然这要受制于undo_retention参数设置的大小,毕竟这部分信息是放在undo segment上的。 Oracle 10g提供了一些pseudo-columns来帮助我们分析每个version的数据, ...
Notice that theFILTERclause has no effect on the number of rows that the subquery defines. Rather, it determines only what rows within thewindoware considered by the particular aggregate function whose invocation is governed by that clause. The values shown in the columns"avg(n)",...
SQL Server uses the IN_ROW_DATA page for the varchar(max) data type if the data is less than or equal to 8000 bytes. If the data grows beyond the 8000 bytes, SQL Server uses LOB_DATA page for the varchar(max) data type Performance comparison between varchar(max) and varchar(n)...