coalesce statement in sql

During this time, writing of LINQ and SQL is missing! Or are you getting old? More and more will not change Problem: ========================================================== ======== VaR ret = from X in LSWhere (String. isnullorempty (Arg. querytext )? True:((X. ?? ""). Toupper (). Contains (Arg. querytext. toupper ())| (X. B ?? ""). Toupper (). Contains (Arg. querytext. toupper ())| (X. c ?? ""). Toupper (). Contains (Arg. querytext. toupper ()))I

Many people do not know how SQL statements are executed in SQL Server, fearing that their written SQL statements will be misunderstood by SQL Server. Like what: SELECT * FROM table1 where name= ' Zhangsan ' and TID > 10000 and implementation: SELECT * FROM table1 where TID > 10000 and name= ' Zhangsan ' Some people

Question one: The difference between statement and PreparedStatementFirst of all, what is statement in Java:statement is an important way for Java to perform database operations to send SQL statements to the database, based on the database connection that has been established. Specific steps:1. First import java.sql.*; this package.2. Then load the driver, create

SQL--MYSQL query statement Daquan, sqlmysql statement 1: Use the SHOW statement to find out the current database on the server: Mysql> show databases; 2. Create a database named MYSQLDATA Mysql> create database mysqldata; 3: select the database you created Mysql> use mysqldata; (when you press the Enter key to see Data

ArticleDirectory In the SQL statement, the as statement can have the same name as the front field. In the SQL statement, the as statement can be the same as the preceding field: Select *, CaseMycolumnnameWhen '0' then' out

Tags: obj tail string nbsp Declare put comment out set /************************************************************************************************************** **************************************** Dynamic statement syntax: Exec/sp_executesql syntax Finishing Man: China Wind (Roy) Date: 2008.06.06 *************************************************************************************************************** *********

"The latest X of every Y" is a classic SQL problem that is frequently encountered at work. Of course, it is not as simple as "querying the latest X value by Y Group". It requires the record or primary key ID of the latest X. You can use an SQL statement to solve this problem. Generate instance tables and data: "The latest X of every Y" is a classic

The following statements are part of a MSSQL statement and cannot be used in access. SQL Category: ddl-Data Definition language (create,alter,drop,declare) dml-Data Manipulation Language (Select,delete,update,insert) dcl-Data Control Language (Grant,revoke,commit,rollback) First, briefly introduce the underlying statement: 1, Description: Create a database CREAT

shows that the syntax of the subquery statement is not checked, but filtering plays a role, which is indeed a strange thing. If I mistakenly typed select xid in select * from tb1 where id in (select xid from tb2) into select id when I typed an SQL statement, then there will be a problem with the Retrieved Data (full extraction), but there is no prompt, because t

Condition Query Queries with relational operators and logical operators: Example: SELECT * FROM student where sno>3; Query with in Keyword: example: SELECT * from student where Sno in (1,3,6); Query with between and keyword: example 1:select * from student where Sno between 3 and 5; Null value query with IS NULL keyword: example: SELECT * FROM student where ZnO is null; Query with a like [not like] Keyword: example 1:select * from student

In php, how does the select command obtain the val value and transmit it to the SQL statement? click the data on the right on the left. The code is as follows: Script Document. getElementById ("sel"). value = "3 "; Document. getElementById ("sel"). fireEvent ("onchange "); Function demo () { Var d = document. getElementById ("sel"). value; Document. getElementById ("tex"). value = d; Alert (d ); } Scrip

Loop operations are the most common problems in databases. The following describes the syntax of SQL loop statements and multi-branch statements separately. It is helpful for you to learn SQL loop statements. 1. Loop syntax While (condition -- expression only) Statement or statement Block [Break] -- force exit Exa

automatic SQL Optimization Figure 1 artificial intelligence automatic SQL Optimization Artificial Intelligence automatic SQL optimization appeared at the end of 1990s. Currently, Lecco Technology Limited (linggao scientific research Co., Ltd.) owns this technology in the commercial database field and provides the Lecco SQL