dynamic query in sql server

When writing a database application, we can dynamically create, modify, and target the database through SQL statements. In this article, I'll show you how to use Visual C # to dynamically manipulate SQL Server databases, including how to create a SQL Server database and how

I gave you an introduction to WinDbg in the previous article and how you can attach to SQL Server. Today's article, we go ahead and I'll show you the steps required to debug a SQL Server query using WinDbg. Sounds interesting? Here we go!Suppose you have a simple

SQL Server 2016 improves the Query Optimizer The first two versions of SQL Server mainly improve performance by providing new features, while SQL Server 2016 mainly improves its existin

The optimization scheme of SQL Server Multi-table query is the main content of this article, we give the optimization scheme and specific optimization examples, then let us take a look at this part of the content. 1. Execution path This feature of Oracle greatly improves the performance of SQL and saves memory usage:

In the previous description of SQL Server parameterized query's where in and like implementation, we introduced several implementation schemes for SQL Server to use parameterized query where in, with XML and Table value parameters missing, here is a supplement ArticleGuide

block according to the pointer on the index block, so that the IO traffic is much less. Second, index optimization technology Is there an index that must be retrieved quickly? The answer is yes. Sometimes it's better to use indexes than to index faster. For example, we want to retrieve all the records in the above table, if not indexed, need access to 8,000 x1000 bytes/8k = 1000 pages, if you use the index, first retrieves the index, accesses 8,000 x10 bytes/8k byte = 10 pages to obtain the ind

sname isn't null --use compound criteria to query ...... /* When using compound statements, you need to combine multiple conditional statements using logical operators and Or Not Each individual conditional statement can be enclosed with () parentheses */ Aggregate functions (for processing results of record data) --aggregate function (for processing results of record data) /* Aggregate functions are some of the column functions that have

Method 1:CREATE TABLE #tabTmp (id int)INSERT #tabTmp EXECUTE (' SELECT ID from ' [email protected])DECLARE curone cursor FORSELECT ID from #tabTmpOpen CuroneFETCH NEXT from Curone to @ID Method 2EXEC ('DECLARE curone cursor GlobalFor ' + @aSql)Open CuroneFetch Curone Method 3:DECLARE @sql varchar (2000),@typefield varchar (100),@tablename varchar (255),@name varchar (100)Select @typefield = ' Name ', @tablename = ' sysobjects 'Set @

Label:The join table operator operates on two input tables. There are three basic types of joins: Cross joins, Inner joins, and outer joins. The difference between the three types of joins is that they take different logical query processing steps, each of which has a set of steps. The cross join has only one step----cartesian product, the inner join has two steps----Cartesian product, filtering, and the outer join has three steps----Cartesian product

Original: SQL Server performance Optimization nolock, greatly improve database query performanceThe company database grows with time, the data is more and more, the query speed is also more and more slow. Into the database to see a bit, hundreds of thousands of of the data, the que