how to compare two table data in sql server

Oracle database The process of creating temporary tables and the contrast with the different points of the SQL Server Temp table is the main content of this article, let's take a look at this part of the content, we hope to be able to help you. 1. Introduction In addition to saving permanent tables, Oracle databases can also create temporary tables temporary ta

Begin A while ago, there was an SQL query requirement in the project, with two tables of the same structure (Table_left Table_right), as follows: Figure 1. Examine the groups (GROUPID) of the table table_left, and whether there is a set of (GROUPID) data in the table table_right that is exactly the same as its

Start A while ago, a project encountered such an SQL query requirement. There were two tables with the same structure (table_left table_right), as shown below: Figure 1. Check whether there is a group of (groupId) data in table table_right that is exactly the same as its data. 1. We can see that the table_left and ta

('t0002','u0005',29.8);INSERT into' Test_a ' (' trade_id ', 'user_id', ' Amount ')VALUES('t0003','u0002',3050);INSERT into' Test_a ' (' trade_id ', 'user_id', ' Amount ')VALUES('t0004','u0003',128.4);INSERT into' Test_a ' (' trade_id ', 'user_id', ' Amount ')VALUES('t0005','u0004',33.7);INSERT into' Test_b ' (' trade_id ', 'user_id', ' Amount ')VALUES('t0001','u0001', -);INSERT into' Test_b ' (' trade_id ', 'user_id', ' Amount ')VALUES('t0002','u0005',29.8);INSERT into' Test_b ' (' trade_i

Start A while ago, a project encountered such an SQL query requirement. There were two tables with the same structure (table_left table_right), as shown below: Figure 1. Check whether there is a group of (groupId) data in table table_right that is exactly the same as its data. 1. We can see that the table_left and ta

Search the internet about the data types of comparison, there are almost no three database comparison, I wrote some of the comparison of the fields, if there is a wrong place, please feel free. Java fields Oracle Fields MySQL Field SQL Server Fields Int Number Int Int Java.lang.double Nu

A) Easy to type, update efficiency:Update table1Set Field1=table2.field1,field2=table2.field2From Table2 where table1.id=table2.idb) Conventional way, this is equivalent to a left join, in the outside where is the number of updates, if not add where is all recordsUpdate table1 Set field1=(select top 1 field1 from table2 where table2.id=table1.id)where table1.id in (condition)SQL Server Update

SQL Server data table field custom Custom Data Format method, SQL Server This document describes how to customize the Custom Data Format of

statement)---Inarithmetic subquerySELECT * | field name [, field Name 2, ...] from data table name where conditional expression in (SELECT * | field name [, field Name 2, ...] from data table name [where condition expression])Cases:Use Commodity Management databaseGoSelect customer name, contact phone from Customer in

SQL Server recovery table-level data details, SQL Server details In recent days, the company's technical maintenance staff frequently asked me to restore the database, because they always have fewer where conditions, resulting in

the rest of the afternoon was thrown to a task: To import street data from across the country into a street table. But the SQL script they threw me was down from the web, completely different from the database design on this side of the platform. the idea was to first generate a table locally on the script that was thr

Example of deleting duplicate records in a data table in SQL Server, SQL Server [Project] The users table in the database contains the u_name and u_pwd fields. The u_name contains dupli

intoScoreValues(3,'3-105', -)Insert intoScoreValues(4,'3-105', -)Insert intoScoreValues(5,'3-105', -)Insert intoScoreValues(6,'3-105', -)--Business: To ensure the complete implementation of the entire process, all without problems, unified submission, once there is a problem, back to the origin. Like bank transfers.Begin Tran--z The start of the transaction--start writing the process statement--After the statement is finishedIf @ @ERROR >0Rollback tran--ROLLBACK TRANSACTIONElseCommit Tran--

This time, the old database has about 0.3 million records. I did this for the first time and didn't think too much about the efficiency. This was implemented with the help of a friend. It took about two hours to complete the process (CPU: Sai Yang 3.06, memory: 1.5 GB, environment: vs2005 + SQL2000), haha! Experience 1: Do not laugh when executing SQL statements. Before coming in, I don't know how to execute multiple

Recently, a project was developed to replace the data table prefix with different schemas (database architecture) when creating a database. This design makes the data table name Friendly and logically clear and more compliant with the SQL

Tags: table name head mod using method ROM SQL Server replace IntermediateNormal spacesBefore and after spaces, use LTrim and RTrim, for example: LTrim (RTrim (Name))Middle space, replace with replace function, for example: replace (Name, ' ', ')If it is an ordinary space, it is easy to replace, but sometimes encounter some special spaces, it is more troublesome,

purchase order of Kingdee ERP. In addition to opening SQL Server Profiler to track its SQL, I want to open this tool again, compare the data difference between the pre-posting and post-posting databases of a purchase order to know what