Question at position 31 What does the CONCAT() function do in MySQL? It adds numbers together It combines multiple rows into one It joins two or more strings together It merges two tables

Question

BlackTom AI · Accepted Answer

First, let's restate the key concept this question tests: what the CONCAT() function does in MySQL.
Option 1 says: 'It adds numbers together.' This is a tempting interpretation if you think of concatenation as arithmetic summation, but CONCAT() does not perform numeric addition; it treats inputs as strings and concatenates them.
Option 2 claims: 'It combines multiple rows into one.' CONCAT() operates on values, not on rows as a set. To combine multiple rows into a single value, you would typically use an aggregate or string-joining technique such as GROUP_CONCAT, which is different from CONCAT().
Option 3 states: 'It joins two or more strings together.' This aligns with the function's purpose: CONCAT() takes two or more string arguments and returns a single string that is the concatenation of those inputs. This description matches the standard behavior of CONCAT() in MySQL.
Option 4 asserts: 'It merges two tables.' This describes a JOIN operation between tables, which is a relational operation at the table level, not the string-level operation performed by CONCAT(). CONCAT() does not merge tables.
In summary, options 1 and 2 mischaracterize the operation as numeric addition or row-level aggregation, option 4 confuses CONCAT() with a table-joining operation, while option 3 accurately reflects that CONCAT() concatenates multiple strings into one. The correct understanding is that CONCAT() joins two or more strings together to form a single string.

Question at position 31 What does the CONCAT() function do in MySQL? It adds numbers together It combines multiple rows into one It joins two or more strings together It merges two tables单项选择题

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Question at position 5 What does the CONCAT() function do in MySQL? It merges two tables It adds numbers together It combines multiple rows into one It joins two or more strings together

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