Quadrant Technologies Data Engineer Interview Questions, Process, and Tips

Daily activities in project involve data collection, processing, analysis, and visualization.

• Collecting data from various sources such as databases, APIs, and files

• Cleaning and preprocessing data to ensure quality and consistency

• Analyzing data using statistical methods and machine learning algorithms

• Creating visualizations to communicate insights and findings

• Collaborating with team members to troubleshoot issues and op

SQL rank assigns unique ranks to rows, while dense_rank allows for ties in ranking.

• Rank assigns unique ranks to rows based on specified criteria

• Dense_rank allows for ties in ranking, assigning consecutive ranks without gaps

• Example: Rank - 1, 2, 3, 4, 5; Dense_rank - 1, 2, 2, 3, 4

To read a parquet file, use a library like PyArrow or Apache Spark.

• Use PyArrow library in Python to read a parquet file: `import pyarrow.parquet as pq`

• Load the parquet file into a PyArrow table: `table = pq.read_table('file.parquet')`

• Use Apache Spark to read a parquet file: `spark.read.parquet('file.parquet')`

PL/SQL stored procedures are written using the CREATE PROCEDURE statement with input/output parameters and SQL statements.

• Use CREATE PROCEDURE statement to define a new stored procedure

• Include input/output parameters in the procedure declaration

• Write SQL statements within the procedure body to perform desired operations

• Use variables, loops, and conditional statements as needed

• End the procedure with the END keyword