许多人在写SQL时都想用if，下面教你正确使用方法。 1、 先准备好待处理的数据，见下图所示。 2、 许多人使用时习惯在select语句中直接嵌入if条件，所示。 3、 在SELECT语句中，通常使用CASE来实现IF的功能，具体用法所示。 4、 随后即可得出if语句的执行结果 ...

Well, if you happen to be using Sql Server you can do that sort of thing in T-Sql. In Oracle, you can also accomplish the same thing using pl/sql. Either way i'd do it in a stored ...

Specifies the current catalog name. To change it, type a two-level name or ? to list all possible catalogs. Then make a selection from the resulting Select a Member window. Displays the number of ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

A message appears at the top of the SQL Editor window to indicate which SQL is being used. If you need to use a different set of tables, you can create a new Query Manager or talk to your SAS Support ...