sql not empty

35. use SQL query analyzer and SQL profilerUse SQL query AnalyzerUse SQL profilerOptimize T-SQL statementSummaryIn this chapter, we will continue with the description of the pre-stored procedures in Chapter 21st. This chapter describes how to use

One: The value of the field of the query string type is NOT NULL for SQL:[SQL]View Plaincopy SELECT * from tb_cms_flgtinfo_a t where (T.fsta are not null and t.fsta <>'); Main: The above tb_cms_flgtinfo_a is the table name, Fsta is

13. T-SQL and SQL query AnalyzerWhat is SQL?What is T-SQL?Introduce new features of T-SQLHow to Use T-SQLSummaryIn this chapter, we will introduce some basic concepts about the Structured Query Language and transact-SQL and their differences. This

String. Empty is equivalent to ""Typically used for initialization of stringsLike what:String A;Console.WriteLine (a);//error here, because there is no initialization of a And the following will not error:String a=string. Empty;Console.WriteLine (a);

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,

Copy codeThe Code is as follows: CREATE function getcolor (@ Varchar (50), @ varchar (50 )) Returns varchar (200) As Begin Declare @ SQL varchar (2000); set @ SQL ='' -- Distinct Select @ SQL = @ SQL + color + ', 'From ( Select distinct color from

Like what:Select FirstName + lastName from employeeHere I want to first determine whether LastName is empty, if it is empty LastName returns the specified default value, and returns the value in the database without being empty.Select FirstName +

Beginners to consult, the purpose is to determine the form came over the data, if the blank prompt for the user and password, and do not execute down the SQL, if the form inside the data has a value to execute the following SQL statement, here first

How to tell if the user name and password are empty do not execute the following SQL statement Beginners to consult, the purpose is to determine the form came over the data, if the blank prompt for the user and password, and do not execute down the

*sql optimization based on ORACLE11GR2 reading notes * Third, cursor in OracleThe cursor in Oracle is a vector of SQL parsing and execution in an Oracle database and is a data structure for C (Oracle is written in C).There are two types of cursor in