Chapter 8 Answers
The semicolon is used by MySQL to separate or end commands. If you forget to enter it, MySQL will issue a prompt and wait for you to enter it.
To see the available databases, type
SHOW databases;
. To see tables within a database that you are using, typeSHOW tables;
. (These commands are case-insensitive.)To create this new user, use the
GRANT
command like this:GRANT ALL ON newdatabase.* TO 'newuser' IDENTIFIED BY 'newpassword';
To view the structure of a table, type
DESCRIBE
tablename
;
.The purpose of a MySQL index is to substantially decrease database access times by maintaining indexes of one or more key columns, which can then be quickly searched to locate rows within a table.
A
FULLTEXT
index enables natural-language queries to find keywords, wherever they are in theFULLTEXT
column(s), in much the same way as using a search engine.A stopword is a word that is so common that it is considered not worth including in a
FULLTEXT
index or using in searches. However, it does participate in a search when it is part of a larger string bounded by double quotes.SELECT DISTINCT
essentially affects only the display, choosing a single row and eliminating all the duplicates.GROUP BY
does not eliminate rows, but combines all the rows that have the same value in the column. Therefore,GROUP BY
is useful for performing operations such asCOUNT
on groups of rows.SELECT DISTINCT
is not useful for that purpose.To return only those rows containing the word Langhorne somewhere in ...
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