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select语句中if的使用技巧

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 ...
Ars Technica

[SQL] Handle SELECT INTO #TempTable In IF/ELSE Statement

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 ...
TechRepublic

SQL basics: SELECT statement options

Learn how to master the SELECT statement to form truly useful data queries. This article explains functions, clauses, and keywords that will make your life a lot easier. Due to popular demand, we’re ...
Ars Technica

Powershell. SQL Query. How to determine if a query returns no results?

You could also add the row in the SQL query. SELECT MAX (TimeStamp) TimeStamp, COUNT (*) RowCount FROM ... And check RowCount first. Second suggestion worked! The first suggesiton didn't work because ...
TechRepublic

How to query multiple tables in SQL

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 ...