57. During data cleansing, an analyst found certain inconsistencies in a column and wants to overwrite a few cells of the table. Which Structured Query Language (SQL) query should the analyst use?
Answer: B
B) UPDATE query
The analyst should use the UPDATE query to overwrite specific cells in a table during data cleansing. This query allows for modifying existing records by setting new values for specified columns based on certain conditions.
A) INSERT INTO query
The INSERT INTO query is used to add new rows to a table rather than modifying existing ones. Since the analyst is looking to overwrite certain cells, this option is not suitable for the task at hand.
B) UPDATE query
The UPDATE query is specifically designed for changing the values of existing records in a table. It allows the analyst to specify which rows to modify and what new values to assign, making it the correct choice for addressing inconsistencies in the data.
C) SELECT query
The SELECT query is used to retrieve data from a database without making any changes to it. Since the analyst needs to modify existing data, this option does not fulfill the requirement for overwriting cells.
D) CREATE TABLE query
The CREATE TABLE query is utilized to create a new table within a database. This option is irrelevant to the analyst's goal of updating existing data, and therefore is not applicable in this context.
Conclusion
The UPDATE query is essential for modifying existing records, making it the only suitable option for the analyst's need to overwrite certain cells during data cleansing. All other options either do not pertain to modifying data or serve entirely different purposes within SQL operations.