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UNION combines and removes duplicates, UNION ALL combines without removing duplicates.
UNION merges the results of two or more SELECT statements into a single result set.
UNION ALL does the same as UNION, but it does not remove duplicates.
UNION is more resource-intensive than UNION ALL because it performs a sort operation.
UNION ALL is faster than UNION when all records are required.
Example: SELECT column1 FROM table1 UNI...
To delete duplicate records from a table, we can use the DISTINCT keyword or GROUP BY clause.
Use the DISTINCT keyword to select unique records and insert them into a new table
Use the GROUP BY clause to group records by a specific column and select only one record from each group
Use the DELETE statement with a subquery to delete duplicate records
Create a unique index on the table to prevent duplicate records from being
I applied via Approached by Company and was interviewed before Apr 2022. There were 3 interview rounds.
posted on 4 Jan 2025
I went for interview in 2019 as fresher , First round was CCAT , Where you will have to solve 30 questions in 15 minutes
Since there were too many people , Group discussion on various topics were held to filter more candidates
I applied via Referral and was interviewed in May 2024. There were 5 interview rounds.
Order of execution refers to the sequence in which operations are carried out in a program or system.
Execution starts from the top of the program and moves downwards.
Operations within parentheses are executed first.
Multiplication and division are executed before addition and subtraction.
Functions are executed when they are called.
Control structures like loops and conditionals affect the order of execution.
Use a SQL query to find different routes for an airline based on source and destination columns in a table.
Use a SELECT statement to retrieve the distinct combinations of source and destination.
Use the DISTINCT keyword to ensure only unique routes are returned.
Order the results by source and destination for easier analysis.
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
Two dynamic programming challenges at the hard level on LeetCode and 10 medium-level SQL challenge.
Postfix mail server can be managed and configured using configuration files and command line tools.
Edit the main configuration file /etc/postfix/main.cf to make changes to the server settings
Use postconf command to view or change configuration parameters
Restart the postfix service after making changes for them to take effect
Utilize tools like postmap to manage lookup tables for postfix
Monitor mail server logs for troub
To fix an OS in maintenance mode, reboot the system, check for any recent changes or updates, run diagnostics, and restore from a backup if necessary.
Reboot the system to see if it resolves the issue
Check for any recent changes or updates that may have caused the OS to go into maintenance mode
Run diagnostics to identify any hardware or software issues
Restore the OS from a backup if needed
posted on 8 Jan 2025
I applied via Company Website and was interviewed in Jul 2024. There was 1 interview round.
posted on 11 Apr 2024
I applied via Referral and was interviewed before Nov 2023. There were 2 interview rounds.
DS algo questions with about 3 questions in topic like graph, strings ,arrays
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