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

查看解析

登录即可查看完整答案

类似问题

Which statement correctly creates a new variable by combining the two string variables: firstName and lastName?

What is it called when you join two strings together in Python?

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

What will be the value of the variable string after the following code executes? string = 'Hello' string += ' world!'

The following code will display 'yes + no': mystr = 'yes' yourstr = 'no' mystr += yourstr print(mystr)

Question9 what is printed by the code below? a='4'b='6'print('The result is', a + b) Select one alternative: The result is 46 The result is 10 TypeError IndentationError ResetMaximum marks: 2 Flag question undefined

Question24 Which of the following method(s) can be used to concatenate two strings in Python? Select one or more alternatives: str.append() + operator str.concat() str.join() ResetMaximum marks: 3 Flag question undefined

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单