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 ...

在当今数据驱动的时代，掌握结构化查询语言（SQL）已成为数据领域从业者的必备技能。作为管理关系型数据库的标准语言，SQL凭借其强大的功能和广泛的应用场景，成为大数据技术栈中的核心工具之一。无论是数据分析、数据挖掘还是数据库管理，基础SQL能力都是开启 ...

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 ...

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 ...

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 ...

We list the best SQL online courses, to make it simple and easy to learn how to mange, code, and run databases, covering everything from beginner to advanced users. The Structured Query Language or ...