In SQL Server, like "use <<DatabaseName>>", how to "use …
2019年10月30日 · When you connect to Sql Server, you are connecting to a specific server instance. A server instance can host a number of different databases. The USE Database command allows you to tell Sql Server which database in that instance to use. A corresponding USE Server command does not make sense. Other server instances are not connected to or …
Should I use != or <> for not equal in T-SQL? - Stack Overflow
2018年3月26日 · Yes; Microsoft themselves recommend using <> over != specifically for ANSI compliance, e.g. in Microsoft Press training kit for 70-461 exam, "Querying Microsoft SQL Server", they say "As an example of when to choose the standard form, T-SQL supports two “not equal to” operators: <> and !=.
sql server - sql use statement with variable - Stack Overflow
-- 1 USE @DatabaseName -- 2 EXEC sp_sqlexec @Sql -- where @Sql = 'USE [' + @DatabaseName + ']' To add a little more detail. EDIT: I would like to perform several things on two separate database, where both are configured with a variable. Something like this: USE Database1 SELECT * FROM Table1 USE Database2 SELECT * FROM Table2
sql server - How do I perform an IF...THEN in an SQL SELECT?
2008年9月15日 · From SQL Server 2012 you can use the IIF function for this. SELECT IIF(Obsolete = 'N' OR InStock = 'Y', 1, 0) AS Salable, * FROM Product This is effectively just a shorthand (albeit not standard SQL) way of writing CASE. I prefer the conciseness when compared with the expanded CASE version.
sql server - How can I do something like: USE @databaseName
2010年9月24日 · Having multiple instances of the same database is certainly unusual, but it's not fundamentally wrong. The fundamental architecture flaw here is in SQL server's inability to easily access different databases at runtime in a simple and safe way, instead forcing us to use dynamic sql which both sucks and opens up possibility of injection, etc.
sql server - using "USE" keyword Vs. full table name in T-SQL
2014年2月18日 · I'd tend to use [server].[database].[schema].[table] in instances where a script may query mutliple tables from multiple databases. The USE [database] would typically be used in scenarios where all statements were to apply to the same database and you needed to make sure they were applied to the correct database.
What does the "@" symbol do in SQL? - Stack Overflow
2012年7月30日 · The @CustID means it's a parameter that you will supply a value for later in your code. This is the best way of protecting against SQL injection. Create your query using parameters, rather than concatenating strings and variables. The database engine puts the parameter value into where the placeholder is, and there is zero chance for SQL injection.
c# - How to configure UseSqlServer? - Stack Overflow
2018年4月15日 · Now I want to use this configuration file in ConfigureServices method of Startup and use extension method AddDbContext to register my ApplicationDbContext to use the SQL database (SportStore) I assigned in the configuration file :
How can I do an UPDATE statement with JOIN in SQL Server?
To perform an UPDATE statement with a JOIN in SQL Server, you can use the JOIN syntax in combination with the UPDATE statement. Here's an example query that should update the ud table based on the corresponding values from the sale table: UPDATE ud SET ud.assid = sale.assid FROM ud JOIN sale ON ud.id = sale.udid;
What is "with (nolock)" in SQL Server? - Stack Overflow
2009年3月27日 · I use with (nolock) hint particularly in SQLServer 2000 databases with high activity. I am not certain that it is needed in SQL Server 2005 however. I recently added that hint in a SQL Server 2000 at the request of the client's DBA, because he …