ServiceNow Technical Support Engineer Interview Questions and Answers

To get data in a table using js, you can use DOM manipulation methods like getElementById or querySelector. Other ways to print output include console.log and innerHTML. A block in js is a set of statements enclosed in curly braces.

• Use getElementById or querySelector to get data in a table using js

• Other ways to print output include console.log and innerHTML

• A block in js is a set of statements enclosed in curly braces, used to group code together

Scope refers to the visibility and accessibility of variables in a program. Logical operators are used to perform logical operations in code.

• Scope in programming refers to where in the code a variable can be accessed. It can be global, local, or block scope.

• To solve an error in the code, first identify the error message or behavior causing the issue. Then, debug the code by checking for syntax errors, logical errors, or runtime errors.

• Logical operators in programming are used...read more

Different types of joins include inner join, outer join, left join, and right join.

• Inner join: Returns rows when there is a match in both tables

• Outer join: Returns all rows when there is a match in one of the tables

• Left join: Returns all rows from the left table and the matched rows from the right table

• Right join: Returns all rows from the right table and the matched rows from the left table

Errors in log files in Linux can be found by searching for keywords, timestamps, and error codes.

• Use 'grep' command to search for specific keywords or error codes in log files

• Look for timestamps to identify when errors occurred

• Check for any error messages or warnings that may indicate issues

• Use 'tail' command to view the end of log files for recent errors

• Consider using 'journalctl' command for system logs in systemd-based Linux distributions

Tuning a SQL query involves optimizing its performance by adjusting various factors.

• Identify slow performing queries using tools like SQL Profiler or Execution Plan.

• Optimize query structure by using appropriate indexes and avoiding unnecessary joins.

• Consider rewriting the query to use more efficient techniques like subqueries or CTEs.

• Update statistics on tables involved in the query to ensure accurate query execution plan.

• Limit the result set by using WHERE clause effectively...read more