tsql nullif

', ' sysname ', ' sql_variant ', ' smallmoney ', ' smallint ', ' smalldatetime ', ' ntext ', ' money ', ' int ', ' image ', ' HierarchyID ', ' Geometry ', ' geography ', ' float ', ' datetimeoffset ', ' datetime2 ', ' datetime ', ' Date ' , ' bigint ', ' bit ') then ' when t.name in (' varchar ', ' varbinary ', ' real ', ' numeric ', ' decimal ', ' char ', ' binary ') Then ' (' + isnull (CONVERT (Varchar,nullif (c.max_length,-1), ' Max ') + isnull (

PostgreSQL supports case,coalesce,nullif,greatest,least conditional expressions, and using them can sometimes simplify many feature implementations.Test tableTest=#Create TableTbl_test (IDint, namevarchar( +), Sexvarchar(1));CREATE TABLETest=#Insert intoTbl_testValues(1,'Zhang San','m'),(2,'John Doe','m'),(3,'Harry','F');INSERT 0 3 CaseCase is similar to if/else in other languages, and different operations are performed when different conditions are

Do not specify a for update when defining a cursor or for read only,ase to check to see if the cursor is updatable;If a cursor query statement contains an ORDER BY clause, the ASE defines the cursor as read-only, and in other cases it is defined as an updatable cursor;If you do not involve updating or deleting table data, we recommend that you include the for Read Only option in the cursor definition so that the ASE defines the cursor as read-only;Table customer has a unique index on the C_custk

MySQL has 4 functions for conditional operation, which can implement the conditional logic of SQL, allowing the developer to transform some application business logic into the database background.MySQL Control flow function:Case When[test1] then [RESULT1] ... else [default] END If TESTN is true, returns RESULTN, otherwise returns the default Case [Test] when[val1) Then [result] ... else [Default]end returns RESULTN if test and valn are equal, otherwise returns the defaultif (test,t,f) if test i

comparison operation. NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP code is as follows copy code mysql> Select IF (0.1,1,0); -> 0 Mysql> Select IF (0.1 -> 1 In the first case above, if (0.1) returns 0, because 0.1 is transformed to an integer value, which results in the test if (0). This may not be what you expected. In the second case, the comparison tests the original floating-point value to see if it is Non-zero, and the result of the

Sql*loader command to enter data in a DOS windowC:\>sqlldr Userid=system/manager Control=input.ctlThe default log file name is: Input.logDefault bad record file is: Input.bad2. There is another wayYou can save the Excel file as a CSV (comma delimited) (*.csv), and the control file will be separated by commas.LOAD DATAINFILE ' D:\car.csv 'APPEND into TABLE t_car_tempFields TERMINATED by ","(Phoneno,vip_car)b) Import data directly into the control file1, control the contents of the file Test.ctl-

Tags: first shortcut tab requires SQL command plan strong using SYSUse of 1.[] When the table that we are looking for is a system keyword or the table name contains spaces, you need to enclose it in [], for example, two new tables, User,user info, then select * FROM User and select * from user info will be error- Need to write: SELECT * from [user] and select * FROM [user info], but do not because there is [] the help of the arbitrary name, it is asking for trouble, but I do see someone named Us

When we do division in SQL Server, we often need to deal with a divisor of zero, because if you encounter this situation, SQL Server will throw an exception with zero divisor error , we do not want to display this exception to the user.Do an example that will report this error, such as the following SQL code:declare @a int;declare @b int;Set @a=10Set @b=0Select @a/@bRun throws an error that encounters a divide-by-zero errorThis chapter focuses on how to handle the two methods of dividing the div

=========== Use of 1.[] When the table that we are looking for is a system keyword or the table name contains spaces, you need to enclose it in [], for example, two new tables, User,user info, then select * FROM User and select * from user info will be error- Need to write: SELECT * from [user] and select * FROM [user info], but do not because there is [] the help of the arbitrary name, it is asking for trouble, but I do see someone named User table for users. 2.

When we do division in SQL Server, we often need to deal with a divisor of zero, because if you encounter this situation, SQL Server will throw an exception with zero divisor error, we do not want to display this exception to the user.Do an example that will report this error, such as the following SQL code:declare @a int;declare @b int;Set @a=10Set @b=0Select @a/@bRun throws an error that encounters a divide-by-zero errorThis chapter focuses on how to handle the two methods of dividing the divi

functions. Database functions The supported database functions are as follows: (1) add, delete, modify, query (crud) of the table, attempt to, Index (2) tsql query join statements (3) triggers (4) tsql Functions (5) Application stored procedures (only tsql) (6) Table Constraints (7) Session-based temporary table (8) Table Variables (9) local transactions (10) se

I will present a challenge, who can use Sqlseerver to propose the best method of calculating primes, I used a new feature CTE and some TSQL implementations, but none of them are ideal, the former (CTE) has a limit, while the latter (TSQL) produces 1 million primes in 7 minutes Can you do a better job? Here are some of my Code passages (TSQL Implementation) SET NO

to top Tsql code to find jobs running over X minutes The following code will return a row for each job that is currently running and has been runningOver the number of minutes set in the @ maxminutes variable. To adjust the time frame it looks,Just change this variable value. DECLARE @MaxMinutes intSET @MaxMinutes = 30 SELECTp.spid, j.name, p.program_name, isnull(DATEDIFF(mi, p.last_batch, getdate()), 0) [MinutesRunning], last_batchFROM master..sysp

(1) call the name of the current topic {dede:type}{/dede:type} (2) Call the parent column, subcolumn, and parallel column names {dede:type} [field:id runphp=yes] $tsql = new DedeSql(false); $typelink2 = ''; $tsql->SetQuery("Select i.typedir,i.typename From #@__arctype t left join #@__arctype i on i.id=t.reid where t.id='@me'"); $

the cache works in ad-hoc and pre-compiled tsql statements.Example:DBCC sqlmgrstatsResult :.Item status.------------------------------------Memory Used (8 K pages) 5446.Number csql objects 29098!Number false hits 425490.-----Memor used (8 K pages): if the number of memory pages is very large, this may be a prompt: Some user connections are preprocessing many tsql statements.Number csql objects: indicates t

pymssql4.1 Freedts is mainly used to directly operate the MSSQL database. It can be automatically installed by compiling or using the yum command. For convenience, the yum method is used for installation. Before using the yum command, we recommend that you set the linux software source as shown in, refer to the http://waringid.blog.51cto.com/65148/904201 ). Note that the epel-release-6-7.noarch.rpm in the epel source has been replaced with the epel-release-6-8.noarch.rpm version, while note the

achieve this effect:At the bottom of the include/common.func.php, add:Content fromTop Column Name The code is as follows: function Gettoptypename ($id) { global $dsql; $row = $dsql->getone ("Select Typename,topid from Jiemou_arctype WHERE id= $id"); if ($row [' topid '] = = ' 0 ') { return $row [' TypeName ']; } else { $row 1 = $dsql->getone ("Select typename from Jiemou_arctype WHERE id= $row [Topid]"); return $row 1[' TypeName '; }} In the art

the http://www.111cn.net/include/helpers/archive.helper.php, find 120 lines or so. The code is as follows Copy Code If (! function_exists (' gettags ')) { function gettags ($aid) { nbsp; Global $dsql; $tags = '; $query = "Select tag from ' dede_taglist ' WHERE aid= ' $aid '"; $dsql->execute (' tag ', $query); while ($row = $dsql->getarray (' tag ')) { $tags. = ($tags = = '' ? $row [' tag ']: ', '. $row [' tag ']); } return $tags; } } The is r

= null;20 public jobwithparametersexample (IScheduler _sched) 21 {sched = _sched;23}24 public virtual void Run () 25 {26 27 2S after execution DateTimeOffset startTime = Datebuilder.nextgivenseconddate (null, 2); Ijobdetail J Ob1 = jobbuilder.createJobwithparametersexample is used to configure the job and trigger, and a listener is defined to listen for the defined job.2 Jobwithparameters 1 using System; 2 using Common.logging; 3 using Quartz; 4 using Quartz.impl; 5 using Quartz.job

Label:Oracle resets the self-increment sequence to the initial value of 1 o'clock, and if it is removed and rebuilt, then the functions and stored procedures that depend on it are invalidated and need to be recompiled. The inverse process is used to change the increment value to (sequence) using the negative step parameter. Nextval-1), and then change back. Suppose you need to modify the sequence name: Seq_name1、SelectSeq_name.nextval fromDual//Assuming results are 56562、AlterSequence Seq_name i