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Indexed column with function

Multiple choice questionThe following two queries produces the same results. The first uses LIKE and the second uses function LEFT. What is the best performing query, given that the column "title" is...

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Optimize queries that refer to nullable columns

True/false questionIs it True or False that it is harder for MySQL to optimize queries that refer to null-able columns.

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MySQL varchar amount of space

Multiple choice questionStoring the value 'hello world' requires the same amount of space in a VARCHAR(11) and a VARCHAR(255) column. Is there any advantage to using the shorter column?

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Using index scans for sorts

Multiple choice questionGiven a UNIQUE KEY: my_key (a_field, b_field, c_field). Which of the following queries will use the key in order to sort the results?

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MySQL Range Condition

Multiple choice questionRange Condition makes MySQL ignore any further columns in the index. Which from the following MySQL queries is considered a Range Condition in MySQL?

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MySQL Blob and Text types

Multiple choice questionWhat is true about MySQL Blob and Text types?

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MySQL ENUM type

Multiple choice questionWhat is true about MySQL ENUM?

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MySQL Packed Indexes

Multiple choice questionWhat is true about MySQL Packed Indexes?

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Join Decomposition

Multiple choice questionJoin decomposition is a process of decomposing a join: running its single table queries parts and then composing the results at the application side. Can join decomposition give...

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MySQL Performance Quiz

Questions:12Attempts allowed:UnlimitedAvailable:AlwaysPass rate:75 %Backwards navigation:AllowedTake this MySQL performance quiz. MySQL Query and index optimization are the first and most important...

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