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6 lip 2011 · Select * From [yourtable] With (Index(1)) Where ... The choice is yours. Look at the table's index properties in the object panel to get an idea of which index you want to use.
The USE INDEX (index_list) hint tells MySQL to use only one of the named indexes to find rows in the table. The alternative syntax IGNORE INDEX (index_list) tells MySQL to not use some particular index or indexes.
In addition, MySQL allows you to recommend the indexes that the query optimizer should consider using an index hint. Here’s the basic syntax for using the USE INDEX hint: SELECT select_list FROM table_name USE INDEX (index_list) WHERE condition; Code language: SQL (Structured Query Language) ( sql )
The use of index hints provides the optimizer with information about how to choose indexes during query processing. For a description of the syntax for specifying these hints, see Section 10.9.4, “Index Hints” .
MySQL uses indexes for these operations: To find the rows matching a WHERE clause quickly. To eliminate rows from consideration. If there is a choice between multiple indexes, MySQL normally uses the index that finds the smallest number of rows (the most selective index).
The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set. SELECT Syntax. SELECT column1, column2, ... FROM table_name; Here, column1, column2, ... are the field names of the table you want to select data from.
21 cze 2024 · The MySQL SELECT statement is used to retrieve data from one or more tables in a database. It allows you to specify which columns of data you want to fetch, apply conditions to filter rows, sort the results, and limit the number of rows returned.
