The indexes on a the tables of a large database make a huge difference in its performance and utility. Without an index, locating a single record in a large table can take several seconds; with the ...

Dynamic PHP pages give you the option to choose a MySQL table dynamically from which to query. You must ensure that the table exists before running a query on the table. PHP has a quick function that ...

Creates indexes on columns in tables. Restriction: You cannot use CREATE INDEX on a table accessed via an engine that does not support UPDATE processing. an IN subquery where the column in the inner ...