Robert Cain continues a series on KQL:
Let me tell you about
let, my favorite operator in the Kusto Query Language. Why my favorite?It is extremely flexible. It lets you create constants, variables, datasets, and even reusable functions. Let me tell you, it’s very powerful.
My big problem with let, specifically with variable creation, is that the variables do not persist between batches. You can use variables between statements but only if you execute all relevant statements in one batch. This makes it harder for exploratory query building.