sql server isnull in where clause

sql| function Just looked at the functions isnull in the SQL Server section of Transact-SQL Reference online documentation and found that there are different uses of the common IsNull function: The

following example selects the title, type, and price for all books in the titles table. If the price of a title is NULL, then the price shown in the result set is 0.00.Use pubsGOSELECT SUBSTRING (title, 1,) as title, type as type,ISNULL (Price, 0.00) AS-priceFrom titlesGOHere is the result set:Title Type Price--------------- ------------ --------------------------The Busy execut business 19.99Cooking with Co business 11.95You Can Combat business 2.99

('170103','Tony','2016-03-04','002'); Insert intoEMPLOYEESValues('170105','Aaron','2016-08-03','002'); Insert intoEMPLOYEESValues('170107','Rex','2016-10-11',NULL); Unwind Code The above topic, we are very easy to produce this idea, first in the employee table EMPLOYEES to find out the department number of employees hired in 2015, as a department of the chant Collection, and then in the Department table departments to find out in the sub-set department number and department ID, that is, the re

tb_emp'); end; 5. Restrictions on bulk collect1. The bulk collect clause cannot be used for associated arrays that use string-type keys.2. You can only use Bulk collect in the server program. If you use it on the client, an error that does not support this feature will be generated.3. the target object of bulk collect into must be of the collection type.4. Compound targets (such as object types) cannot be

Collate is a clause that can be applied to database or column definitions to define sorting rules, or to string expressions to apply sorting rule conversion. Syntax Collate { {Windows_collation_name} | {SQL _collation_name} Parameters Collation_name Name of the sorting rule applied to expressions, column definitions, or database definitions. Collation_name can be specified onlyWindows_collation_nam

record.Patindex and CharindexThe PATINDEX function supports the use of wildcard characters and can be used in a number of changing lookups. and charindex not to be. Depending on your situation, these two functions are useful for searching, controlling, and analyzing strings in SQL Server. Second, SQL Server charindex

SQL top plays an important role in the advanced operations of the database, which is explained in this article. TOP clause The TOP clause is used to specify the number of records to return. The TOP clause is useful for large tables with thousands of records. Note: Not all database systems support the TOP

is returned. Formula:Example:Select sex,sclass,sumfromgroupbygrouping sets (Sclass,sex)Results:Let's look at the first row of data in the result set, grouping_id (Sclass,sex) =grouping (sclass) *2^1+grouping (Sex) *2^0In the first row of data, the grouping (sclass) result is 1, grouping (sex) result is 0, the concatenation of the binary data is 10,grouping_id (sclass,sex) =1*2^1+0*2^0 result is 2, The grouping_id () in each row is computed in this way.Summarize: The cube

U-Mail system injection (SQL Injections in MySQL LIMIT clause case) SQL Injections in MySQL LIMIT clause, which happens to be a defect in the email system. This is a case study. The administrator password can be obtained through injection. The cause of the vulnerability. The limit in the

Problem descriptionYou want to down the database from the server. Operation: First dump the database into a SQL file, and then run the SQL file locally using Navicate, an error message appears:inch DEFAULT or on UPDATE clauseSolution IdeasReference:Http://www.cnblogs.com/joeylee/p/3877578.htmlCause: In timestamp, there are two timestamp fields in a table that are

The tutorials on SQL having clauses are in the following format: 1 SelectColumn_name, aggregate_function (column_name)2 FromTable_name3 WhereColumn_name operator Value4 Group ByColumn_name5 HavingAggregate_function (column_name) operator Value This column is above w3school, link: http://www.w3school.com.cn/ SQL/SQL _having.asp The aggregate function after h

MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small, creating a bottleneck effect.3, no computed columns are created causing the query to be not optimized.4, Low memory5, network speed is slow6, query out the amount

when there are no other methods. In addition, we can use some features of SQL Server to replace the cursor to increase the speed. A. Example of string connection This is a common example in the Forum. It is used to concatenate a string field of a table's qualified record into a variable. For example, to connect the fname of the employee whose job_id = 10 together with a comma, the most likely thing t

consumption of database resources (especially memory and lock resources) is very large. Therefore, we should use the cursor only when there are no other methods. In addition, we can use some features of SQL Server to replace the cursor to increase the speed. A. Example of string connection This is a common example in the Forum. It is used to concatenate a string field of a table's qualified record in

database is able to perform set operation of the tool, we should try to use this tool, so-called set operation is actually a batch operation, is to minimize the large amount of data in the client loop operation, Instead, use SQL statements or stored procedures instead. It is hard to understand the idea and the consciousness, which needs to be realized in the programming process.Here are some things to note in the programming phase:1.Return only the d

ansi SQL standard. SQL Server uses an extended set of ANSI SQL-92, called a T-SQL, which complies with the ANSI SQL-92 standards.The SQL language includes two main programming language

Tags: Scroll method prepare win section data body multiple ICAThe most obvious feature of SQL differs from other programming languages is the order in which the code is processed. In a large number programming language, code is processed in encoded order, but in the SQL language, the first processed clause is the FROM clause