There's the (almost religious) discussion, if you should use LIKE or '=' to compare strings in SQL statements. Are there reasons to use LIKE? ... <看更多>

前言SQL 內建函數有多種，而最常使用的四大函數分別為聚合函數（Aggregate Functions）& 字串函數（String Functions）& 數值函數（Mathematical ... ... <看更多>

The biggest factor that I can think of is that LEFT(MyField,5) and CHARINDEX('HELLO',@MyField) won't use an index unless the index matches the expression ... ... <看更多>

SQL pattern matching allows you to find data that fits a certain pattern, ... For example, you can use the wildcard "C%" to match any string ... ... <看更多>