first() function Empty tables Examples Related articles first() function The first() function selects the first non-null record from an input table. *Function type: Selec...
first() Required Arguments Sample Usage first() The first aggregate allows you to get the value of one column as ordered by another. For example, first(temperature, time) wi...
First 过滤操作符 first(Func1) firstOrDefault firstOrDefault(Func1) takeFirst single single(Func1) singleOrDefault singleOrDefault(T,Func1) First 只发射第一项(或者满足某个条件的第一项)数据 如...
first signature: first(predicate: function, select: function) Emit the first value or first to pass provided expression. Examples Example 1: First value from sequence Example 2...