coalesce statement in sql

$ session where sid = '20140901 ';Query the corresponding SQL statement based on the sidSelect SID, SQL _TEXT from v $ open_cursor where SID = '000000 '; 20. View wait StatusSELECT v $ waitstat. class, v $ waitstat. count, SUM (v $ sysstat. value) sum_valueFROM v $ waitstat, v $ sysstat WHERE v $ sysstat. name IN ('db block gets ','Consistent gets') group by v

columnsIf the identity column is referenced in an SQL statement, the keyword IDENTITYCOL is used insteadFor example, to query for rows with an ID equal to 1 in the previous example,The following two query statements are equivalentSELECT * from T_test WHERE identitycol=1SELECT * from T_test WHERE id=16. Get the seed value of the identity columnYou can use the function ident_seed, usage:SELECT ident_seed ('

automatically:SELECT [extent1].[ No] as [no], [extent1].[ Age] as [age], [extent1].[ Name] as [name] from [dbo].[ EMP] as [Extent1] ORDER by [extent1].[ Name] ASC Because in SQL server 2012 and later databases, there is a higher performance paging method that uses offset ROWS FETCH NEXT rows only keywords, EF automatically generates matching SQL statements based on different versions o

Tags: content introduction SSI SQL DMI span get review sectionWhen using MS SqlServer2012 for data export, the query statement used was exported, but an error occurred: "An unknown column type conversion was found for XXYou can only save this package " When you click the column to see the detailed error message, you can see: [Source information]SOURCE Location: 192.168.1.97SOURCE provider: SQLNCLI11Table: [

T-SQL statement to modify the logic name, database name, and physical name of the SQL Server database, t-sqlsql This example describes how to modify the logical name, database name, and physical name of the SQL Server database using the T-SQL

SQL Statistics this week, this month, next week, the next month SQL statement/*Table structure Student (s#,sname,sage,ssex)--s# student number, sname student name, Sage birth date, ssex student gender Save some data INSERT into Student values (' ', n ' wwww.111cn.net ', ' 1990-01-01 ', n ' Men ') INSERT into Student values (' ", N ' money electr

Insert into OPENROWSET (' microsoft.ace.oledb.12.0 ', ' Excel 12.0;database=c:\c.xlsx ', ' Select field 1, Field 2 from [sheet1$] ')Select field 1, Field 2 from tableToday, the unit of an ASP, there is a function is exported data, found an export error, error content is:SQL Server blocked the component ' Ad Hoc distributed Queries ' STATEMENT ' Openrowset/opendatasource ' access because this component has been shut down as part of this server's securi

Tags: style blog http ar os using SP on dataText: The exists in the SQL drip 35-sql statementFor example, in the Northwind database there is a query for select C.customerid,companyname from Customers C where EXISTS (select OrderID from Orders o where O . Customerid=c.customerid) How does this exists work? The subquery returns the OrderID field, but the outside query is looking for the CustomerID and Company

of years in Date_expression DATEADD (--function returns a date with the specified date plus the specified extra date interval number DATEDIFF (--function returns the difference in datepart between two specified dates Datename (DATEPART (GETDATE ()--function returns the current date and time of the system in datetime default format ----System Functions---- App_name ()--function returns the name of the currently executing application COALESCE (

I. Overview of SQL statements(1) SQL is a " Structured Query Language (structured Language)".SQL is the standard query language used by most mainstream database systems.(2) The advantages of SQL statement: The language structure is simple, powerful, simple and easy to learn.

], the SQL statements that appear @thedate are all replaced with @variable.(2) Hide the affected SQL statements, such as:A) Put the affected SQL statements into one of the sub-stored procedures, for example, we call a word stored procedure after the @thedate setting becomes today to pass the @thedate as a parameter.b) Use sp_executesql to execute the affected

Usually SQL database needs optimization analysis, and there are some techniques, SQL optimization of several methods here do not do a detailed introduction, this article will be summarized in SQL statement optimization, followed by an optimization tool SQL Tuning Expert for

One SQL statement queries multiple databases and multiple SQL statements Requirement: An SQL statement is used to query the associated results from multiple databases and output them to the client. Investigation: The spring framework can configure multiple data sources.

How to display all SQL statements in the program file and the running time of each SQL statement? Php + mysql. if you want to analyze the SQL running status, read the "TheSlowQueryLog" section in the mysql manual and analyze the log file, in the database connection class, how does one display all

One SQL statement interview question: for students who take all courses, SQL statements For a job interview a few days ago, there was an SQL question: three tables are provided: students, courses, and scores. A seemingly simple problem made me difficult. I changed it and changed it, painted it and scratched my ears. Be

Ashamed to say, always make some small mistakes, tangled half a day, this should not be a semicolon of the thing toss for a long time! Error when executing the SQL statement, the information is as follows: Java code [Default] [2012-11-22 11:35:58,552] [ERROR] Java code [com.primeton.common.connection.impl.synchronization.traceloggerstatementsynchronization:49] Java code

When writing a stored procedure in Oracle, a large SQL statement is sometimes used, but when viewed with the Pl/sql tool test you cannot see the SQL, and the discovery can be handled through an Oracle physical temporary table. Add dbms_output.put_line (' SQL

Specific actions: Finds the owner of the currently blocked statement based on the SPID and blocked in the master.dbo.sysprocesses, and then uses DBCC INPUTBUFFER () to view the blocking statement. Example: Open three Query Analyzer A, B, C Create a test table Testdia Create Table testdia (ID int); execute the following statement in a: Begin Tran Insert into Te

SQL server first checks whether a view exists and then creates a view statement. SQL SERVER If our statement is: IF NOT EXISTS(SELECT 1 FROM sys.views WHERE name='Report_IndividualTicket')BEGINcreate view Report_IndividualTicketasSELECT Ticket.TicketNumber, Ticket.TicketID,GisProcess.StageName,Content.DtReceived, Conte

(varchar), GETDATE (), 121): 2008-05-16 10:57:49.700 select CONVERT (varchar), GETDATE (), 126): 2008-05-16t10:57:49.827 select CONVERT (varchar (100), GETDATE (), 130):???? ?????? 1427 10:57:49:907am Select CONVERT (varchar (MB), GETDATE (), 131): 18/04/1427 10:57:49:920am Get SQL Server server time INSERT INTO TableName (Date) value getDate () "Select GETDATE () as Serverdate"The Serverdate property is then read as