SQL是一种用于处理数据的语言,就像我们说的汉语、英语一样,有特定的语法结构,让我们灵活地处理数据。 SQL并不难学,首先得理解 S Q L 三个字母分别代表什么。 Structured Query Language,简写为SQL,意思是结构化查询语言。也就是说SQL是用来查询数据用的,通过代码指令来实现个性化的数据抽取 , SQL Server默认用户名和密码是多少? 美食旅游攻略 2020-05-14 12万+人看过 有时候我们在使用SQL Server数据库的时候,想知道默认的用户名和密码是多少,下面来介绍一下, El SQL Server configuration manager, generalmente es accesible como complemento de la consola de administración (microsoft management console: mmc.exe). Puedes ejecutarlo directamente desde el cuadro de diálogo ejecutar (que a su vez puedes invocar con la combinación de teclas Windows r., What is the best way to get the names of all of the tables in a specific database on SQL Server?, 23 In SQL Server 2012 or higher, you can use a combination of IIF and ISNULL (or COALESCE) to get the maximum of 2 values. Even when 1 of them is NULL. IIF(col1 >= col2, col1, ISNULL(col2, col1)) Or if you want it to return 0 when both are NULL IIF(col1 >= col2, col1, COALESCE(col2, col1, 0)) Example snippet: -- use table variable for testing , The target principal name is incorrect signifies that the Name or IP Address you're using in the Server=; portion of your connection string does not match a CommonName or SubjectAltName in the X.509 certificate provided by the SQL Server which isn't surprising because, by default, SQL Server installs with a self-signed certificate using only .