dynamic query in sql server

XML query in SQL SERVER: FOR XML specifies PATHPreface In SQL SERVER, you can specify RAW, AUTO, EXPLICIT, and PATH for XML queries. This article uses some examples to introduce the XML query of the specified PATH in

Directory Background Problem Ideas CTE CTE recursive query Conclusion References Background I haven't written a blog for a long time. Recently I encountered a problem: "How can I traverse all the sub-Menus under a parent menu ?" Small and then use the CTE recursive query to solve this problem, sort the records for sharing. Problem How to traverse all sub-Menus under a parent menu? Ideas

SQL Server query performance optimization analysis transactions and locks (I) SQL Server query performance optimization analysis transactions and locks (ii) SQL

Fast_forward cursors on small datasets is often preferable to other progressive processing methods, especially if you must reference several tables to obtain the required data. Routines that include "totals" in the result set are typically faster than using cursors. If development time permits, a cursor-based approach and a set-based approach can all be tried to see which method works better.28. Set NOCOUNT on at the beginning of all stored procedures and triggers, set NOCOUNT OFF at the end. Y

Solution 5 use xml Parameters If you are not familiar with SQL server xml type parameters, you must first understand the XQuery concept. Here, an XQuery is a language used to search for and extract elements and attributes from XML documents, simply put, the language used to query xml leads to XPath. In fact, XPath is a subset of XQuery. XQuery 1.0 and XPath 2.0 s

SSMs can provide the ability to view the plans that are being executed. Live query plan can view the execution of a query, from one query plan action to another query plan operation. Live query plan provides overall query run prog

, However, the SQL statements are more complex, and the following is the general formula for paging queries:/** FirstIndex: Start index* PageSize: The number displayed per page* Ordercolumn: Sorted field Name* sql: Can be a simple single-table query statement, or it can be a complex multi-table union query statement*/S

This article gives an SQL statement to display the query between different databases on the same server, noting that the current connected user has permission to two libraries The complete expression of an object in SQL Server SQL

Original: SQL SERVER memory allocation and common memory issues (2)--DMV queryMemory dynamic management view (DMV):Starting from Sys.dm_os_memory_clerks.SELECT [Type], sum (virtual_memory_reserved_kb) as [VM reserved], sum (virtual_memory_committed_kb) as [ VM Committed], sum (awe_allocated_kb) as [awe allocated], sum (shared_memory_r

SQL Server 2016: Identify regression defects through Query Store For most developers, a regression defect in performance can usually be traced back to a special event, such as a large influx of users or code changes. For database developers, the process is not that simple. With the rebuilding of indexes and updating of statistics,

versioning) information, and so on. SQL Server allows users to create temporary tables for their own use, where the physical location of these temporary tables is tempdb. Note: Each time the SQL Server instance is restarted, the contents of the database are deleted and recreated as a copy of the model. Therefore, When

SQL Server database paging query has always been a short board of SQL Server, so I have nothing to worry about. I have come up with several methods, for example, table ARTICLE, field ID, YEAR... (others omitted). There are 53210 million pieces of data (the customer's actual

to large according to the selected key values,SQL Server 2000Later versions can specify that the data is sorted from large to small. The entire data table is sorted from small to large by key value fields, and then combined with the upper-layer index structure of the key value field plus the pointer, that is, the root node and non-slave layer, forming the entire clustered index. Because the actual data p

Process of each stage of SQL Server Query Processing Unlike other programming languages, SQL is most characteristic of code processing. In programming languages with large numbers, the code is processed in the encoding order, but in SQL, the first clause to be processed is t

Label:From: SQL Server Query performance optimization-heap table, fragmentation, and index (i) SQL Server Query performance optimization-heap table, fragmentation, and index (ii) SQL

keysRow: sqlserver2000 not supported Test data:A total of 3.2 million data, each page shows 10 data, respectively, 20,000 pages, 150,000 pages and 320,000 pages were tested. Page number, top scheme, max scheme, row scheme20,000, 60MS,46MS,33MS150,000, 453ms,343ms,310ms320,000, 953ms,720ms,686ms is a paging scheme that uses a program to stitch SQL statements.User-mentioned SQL statements do not need to writ

]+ ', [' [emailprotected]+ '],[' [emailprotected]+ '] ' + ' from [' [email protected]+ ']) p PIVOT (SUM ([' [emailprotected]+ ']) for [' [emailprotected]+ '] in (' + @sql_col + ')) as Pvt Where Pvt.hx_fzone is not null for ORDER by ' [Emailprotected]--print (@sql_str) EXEC (@sql_str) drop table #t_estimateamo Untreasondrop Table #t_ Estimateamountreasontotalend---------------------------------------------------------------------------SELECT @ end_date = getdate () Select DateDiff (MS, @begin_da

SQL Server query performance optimization analysis transactions and locks (2 ). Step 1: Execute Example 2 and Example 3 code in the query analyzer. (This is the example in the previous article SQLSERVER query performance optimization analysis transactions and locks (2) -- Ex

index controls the order of data rows based on key-value fields. Because SQL SERVER sorts data rows by the key-value fields of clustered indexes, when you need to sort certain fields, use these fields as the key-value of clustered indexes, creating a clustered index will greatly improve the query performance. Because the data has been sorted in the order of the

Many people don't know how SQL statements are executed in SQL Server, and they worry that the SQL statements they write will be misunderstood by SQL Server. Like what:SELECT * FROM table1 where name= ' Zhangsan ' and TID > 10000an