sql query to find duplicate records in column

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SQL query records for MAX () Max () in a category field in a table

max_click as select max as From code Group by kind; 2. Filter to ensure only one record per category Select * From (Select id,kind,click_num From code where click_num = ( Select b.click_num From max_click as b where code.kind = B.kind ) ) as a Group by kind; Normal operation, speed 0.78 seconds. (altogether 23,000 data in the table) okay! Done! the first SQL

How to query the code _MSSQL for consecutive date records in SQL Server

There is a forum to see a post, " Consult the query out of the continuous date record method", screenshot as follows: Insus.net tries to write a program and test it to get the expected results, which can be referenced and learned by SQL code. Copy Code code as follows: --Create a temporary table that will store records for consecutive dates

SQL statement tip: Query for data records that exist in one table and not in another

Original: SQL statement tip: Query for data records that exist in one table and not in anotherMethod One (only for single fields)Easy to understand, low efficiency with not inSelect a.ID from A where a.id not in (select ID from B)Method Two (for multiple field matches)Use left Join...on ..., "b.ID isnull" indicates a record in which the b.ID field is null after t

SQL database only one data, query to the table and column name

(64))DECLARE TABLES CURSORForSELECT O.name, C.nameFrom syscolumns CINNER JOIN sysobjects o on c.id = o.idWHERE o.type = ' U ' and C.xtype in (167, 175, 231, 239)ORDER by O.name, C.nameOPEN TABLESFETCH NEXT from TABLESInto @table, @columnWhile @ @FETCH_STATUS = 0BEGINSET @sql = ' IF EXISTS (SELECT NULL from [' + @table + '] 'SET @sql = @sql + ' WHERE RTRIM (LTRIM

When SQL Server creates a composite index, the composite index column order affects the performance of the query

, there is no one-cut means to solve all the problems.Summarize:In this paper, a simple example is given to analyze the effect of the order of columns on the query when creating a conforming index.Note that when creating an index, you should not only consider which columns to create indexes on, but also whether the order of indexed columns will affect the query.Avoid talking about indexing, which is the "Index on

SQL statement Query database table name/column name/primary key/Auto Grow value instance _mssql

SQL statement query table name/column name/primary key/Auto grow value in database ----A table created by a user in a query database ----JSJ01 as database name Select name tablename from JSJ01. sysobjects where type= ' U ' and name not in (' dtproperties ') --field information in the

SQL database query A table create a new sort field and store sorted values based on the sort of a column

Tags: sel over l database query sort name Statement data rankNow there is a table as followsId Name Age classify score1 1181 Class 122 2,172 class 193 3,193 Class 30I'm going to rank them according to their scores. Create a new column store sort valuesThe->sql statement is as followsSelect Row_number () over (order by score ASC) as Number,id,name,age,classify,sco

Query maximum All column information after SQL grouping

CREATE TABLE Students (course varchar), Stu_name varchar (TEN), City varchar (ten), score int INSERT into students values (' math ', ' Jack ', ' Tianjin ', ' n '), insert into students values (' math ', ' Jordan ', ' Tianjin ', 80); INSERT into students values (' math ', ' James ', ' Beijing ', ' n '), insert into students values (' English ', ' Jack ', ' Tianjin ', ' n '); insert into students values (' English ', ' Jordan ', ' Tianjin ', max), insert into students values (' English ', ' James

T-SQL row to column, database query paging

Label:pivotextraalt==time tweenrocexepat 1 use [aps_future_ft] 2 GO 3/****** object:storedprocedure [dbo]. [A_crudeprice] Script DATE:2013/11/5 19:13:21 ******/4 SET ANSI_NULLS on 5 go 6 SET QUOTED_IDENTIFIER on 7 Go 8--=============== ============================== 9--Author: T-SQL row to column, database query paging

SQL query, how to add a column

SELECT * FROM (Select ' Finish_order_info ' as Table_name,count (1) as Num from Fraudorder.finish_order_info where Crt_dt between To_date (' 2014-12-24:00:00:00 ', ' yyyy-mm-dd,hh24:mi:ss ') and to_date (' 2014-12-25:00:00:00 ') group BY ' Finish ' UNION ALLSelect ' Discard_order_info ' as TABLE_NAME, COUNT (1) as Num from Fraudorder.discard_order_info where Crt_dt between to_date (' 2014-12-24:00:00:00 ', ' yyyy-mm-dd,hh24:mi:ss ') and to_date (' 2014-12-25:00:00:00 ') union ALLSelect ' Raw_air

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