Kotlin list any10/31/2023 The performance of this query will depend on the size of the tables and the indexing of the customer_id columns. This query avoids the join operation and instead uses a subquery to find the distinct customer_ids that appear in table_B, and then returns the customer_ids in table_A that are not in that set. On table_A.customer_id = sorted_table_B.customer_idĪnother way to approach this problem is to use a subquery instead of a join: select customer_id This can be achieved with the following query: select table_A.customer_id Kotlin Program â example.The interviewerâs suggestion is to sort table_B by customer_id before joining it with table_A, which would allow for a binary search to be performed on table_B for each customer_id in table_A, reducing the number of iterations needed to find the customers who did not make any orders to n*log(k). Following is an example to print all elements of a list using for loop. To iterate over all the elements of a list, for loop can be used. The filtered output contains elements that satisfy the predicate we passed to filter() function. Kotlin Program â example.kt fun main(args: Array) You can also use array style accessing of elements using square brackets. List.get() is used to read elements of a list using index. ListB is a mutable list of type MutableList. ListA is an immutable list of type List, since each of the element in the list is of type String. The syntax to filter only Integer elements of a List is List.filterIsInstance () filterIsInstance () returns a List. To filter elements of type Int only, call filterIsInstance () method on this method, with the type T specified as Int for filterIsInstance () function.Var listB = mutableListOf("Example", "Program", "Tutorial") A Kotlin List of type Any can store elements of any type. In the following example, var listA = listOf("Example", "Program", "Tutorial") To initialize Kotlin List, use mutableListOf(vararg items : T) method.
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