sql compare two tables for differences

cursor, cyclically obtain table space usage */DECLARE Info_cursor cursorfor select '[' + [name] + ']' FROM sys. tables WHERE type = 'U '; OPEN partition fetch next from partition INTO @ tablename WHILE @ FETCH_STATUS = 0 begin insert into # tablespaceinfo EXEC sp_spaceused @ tablename fetch next from Info_cursor INTO @ tablename end insert into partition (record_date, expiration, expiration, [table_name], [rows_count], reserved, [data_size], index_si

query for the equivalent connection query above is arranged in descending order of the column "Unit Price".SELECT A. Name of the product, B. Name of the supplier, B. Name of the contact person, A. Unit PriceFrom product information A INNER JOIN supplier Information BOn A. Vendor number =b. Vendor numberORDER by A. Unit Price DESCAfter running, the only difference from the above results is that the results of the query are sorted in descending order based on the "Unit price".2.2 Non-equivalent c

Essentially, there is no difference. Only functions are as follows: only one variable can be returned. The stored procedure can return multiple objects. Functions can be embedded in SQL and called in select, but stored procedures cannot. The essence of execution is the same. There are many function restrictions. For example, you can only use table variables instead of temporary tables. some functions are un

Due to work reasons: the databases of the previous company all use MySQL, so they have to use it. Therefore, I also learned some knowledge about MySQL, but considering that I may not be able to use it in the future, I want to take a break at home while I am leaving, and I plan to sort out these things so that I can use them in the future, leave a reference resource. Considering that SQL Server has been used, I plan to directly

Label:Recently read a few SQL query article to do a summary oh, probably précis-writers as follows: The essence of SQL query is that you get a subset of the data from the database, you can take a subset of the columns first, and then take a subset of the rows that match the criteria. 1, single-table query: SELECT [Name], [GroupName] from [AdventureWorks]. [HumanResources]. [Department] WHERE departmentid>1

Editor's note: Have you ever encountered any of these questions about the difference between SQLite and SQL? I have summarized some of the differences that often occur between SQLite and SQL. I hope this will be helpful to you. I. Summary of common questions 1TOP is a frequently asked question. For example, you can use the following syntax in SQLSERVER: Editor's

records for the result set of the last query is greater than or equal to the original record number of the primary table.(2) Where condition is the filter for the result set after the query is complete. The filter criteria field that you can use is arbitrary, because a multi-table query is essentially a full-field join query between multiple tables, except that you can specify the last number of fields to display in a record. The Where condition fund

1.JOIN and Union differences A join is a set of records in which the same conditions are produced when two tables are connected, The Union is the resulting two recordset (the fields are the same) and together to become a new recordset. Join is used to join two tables according to the on condition, with four main types: INNER join: An inner join is a record in tw

with ANSI standards, they must collectively support some key keywords (such as SELECT, UPDATE, DELETE, INSERT, where, and so on) in a similar way But in addition to the SQL standard, most SQL database programs have their own private extensions RdbmsRDBMS refers to a relational database management system. The RDBMS is the foundation of SQL and is also the foundat

one, on filtering and where filteringin the connection query syntax, the other person will be the first to be confused　 The difference between on and where filtering is that if, when we write the query, the filter condition is placed either on the back or in the back, the results are always the same, so why superfluous the SQL query to support both filters? In fact, there are differences between the two fil

does not work because the failover instance is the same as the corrupted file. With mirroring and log shipping, you can copy files in real time, so you don't have to worry about file corruption. In SQL Server, file corruption rarely occurs, so I think the cluster should be a good choice. Disadvantage of. One of the important issues is that the implementation of recovery is very expensive. Microsoft supports failback only on hardware that is certified

The basic syntax for most database statements is the same, but specific to each database, there are some differences, such as triggers, DB2 and SQL Server two are very different.For example, a trigger for DB2:CREATE TRIGGER eas.trname NO CASCADE before insert//INSERT trigger on EAS. T_user referencing new as N_row//Name the newly inserted data as N_row for each row MODE db2sql /per row Insert data s

table is faster than DELETE and uses less system and transaction log resources. The DELETE statement deletes a row at a time and records one row in the transaction log. Truncate table deletes data by releasing the data pages used to store TABLE data, and only records the release of pages in transaction logs. (11) truncate table deletes all rows in the TABLE, but the TABLE structure and its columns, constraints, and indexes remain unchanged. The Count value used by the new row ID is reset to the

Differences between intra-and outer-connection in SQL Server Assume that there are two tables in a database, one is the student table Studentinfo, one is the class table ClassInfo, and the two tables are associated with CLASSID fields. If you are using an inner join, the normal wording is this: Sele

. [TagID] = tags. [TagID]; SELECT tags. [TagID] From [Tags],[tag_rss] WHERE the left JOIN Tag_rss. [TagID] = tags. [TagID]; It is also not feasible to use the + sign instead of the * number after testing.Collection of syntax differences between SQLite and SQL Server1. Returns the last inserted identity value returns the last inserted identity value for SQL Server

GAM, SGAM, PAM, IAM, DCM, and BCM are some of the special allocation mapping tables used in SQL Server to manage spatial allocations. Understanding their differences and roles is very important for understanding the SQL Server Physical database architecture.Management of SQL

page is allocated from the consistent extension.The space page is dedicated to the allocation and management of data spaces, including: PFS pages (page free space): Record whether a page is assigned, in a mixed or consistent extension, and how much space is available on the page; Gam page (Global allocation MAP) and Sgam page (secodary Global allocation map): Used to record the location of an idle extension or a mixed extension containing free pages. Sqls Comprehensive utilization of these thre

In fact, for non-professional database operators, such as software developers, to a large extent, do not know the basic knowledge of database indexing, some are may not tress, or know it is not known why. The main reason for this is that I think industry reasons, there are many companies have their own DBA team, they will help you to optimize SQL, developers even do not understand the optimization problem is not big, so developers do not have much eff

The difference between SQL-based table data deletion and truncatedeletedrop is that the following content is reproduced: learning to use 1. truncate, delete without where clause, and drop will delete table data. 2. drop and truncate are all DDL statements (Data Definition Language), which are automatically submitted after execution. Differences: 1. truncate and delete: only delete data does not The differen

Label:Transferred from: http://www.cnblogs.com/dyufei/archive/2009/11/12/2573974.html Self-evident, look at SQL fully understand, do not need to explain too much, good, share: The result set generated by the ROLLUP operator is similar to the result set generated by the CUBE operator. Here are the specific differences between CUBE and ROLLUP: The result set generated by cube shows aggregations for