1。函数的作用是:返回一个字符串在另一个字符串中的位置。它总是返回字符串的第一个匹配项。它不区分大小写。如果在 string1 中找不到 string2，或者 string1 为 null，或者函数中的 start 参数大于 string1 的长度，则返回 0；如果 string1 为 null，则返回 null；如果 ...

Abstract: Model databases track the accuracy of models on pre-trained weights. The models are stored as executable code and extracted on deployment. Instead of extracting runnable code and data out of ...

Even if generative AI hides SQL behind the curtain, it will continue to play a critical role in how we interact with and use data. In May 1974, Donald Chamberlin and Raymond Boyce published a paper on ...

SQL Window functions are an advanced type of function in SQL. In this post, you will learn about what SQL window functions are and how they can be used or work. What are SQL window functions? SQL ...