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https://dev.mysql.com/doc/refman/5.7/en/silent-column-changes.html
In some cases, MySQL silently changes column specifications from those given in a CREATE TABLE or ALTER TABLE statement. See Section 8.4.7, “Limits on Table Column Count and Row Size”. Columns that are part of a PRIMARY KEY are made NOT NULL ...
https://dev.mysql.com/doc/refman/5.7/en/creating-spatial-columns.html
MySQL provides a standard way of creating spatial columns for geometry types, for example, with CREATE TABLE or ALTER TABLE. Spatial columns are supported for MyISAM, InnoDB, NDB, and ARCHIVE tables. Use the CREATE TABLE statement to create a table ...See also the notes about spatial indexes under Section 11.4.9, “Creating Spatial ...
https://dev.mysql.com/doc/refman/5.7/en/selecting-columns.html
If you do not want to see entire rows from your table, just name the columns in which you are interested, separated by commas.
https://dev.mysql.com/doc/refman/5.7/en/populating-spatial-columns.html
After you have created spatial columns, you can populate them with spatial data. Values should be stored in internal geometry format, but you can convert them to that format from either Well-Known Text (WKT) or Well-Known Binary (WKB) format. For ...
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-column-group-row.html
Task: For each article, find the dealer or dealers with the most expensive price. Other possibilities for solving the problem are to use an uncorrelated subquery in the FROM clause or a LEFT JOIN.
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-column-group.html
SELECT article, MAX(price) AS price FROM shop GROUP BY article ORDER BY article; +---------+-------+ | article | price | +---------+-------+ | 0001 | 3.99 | | 0002 | 10.99 | | 0003 | 1.69 | | 0004 | 19.95 | +---------+-------+ .
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-column.html
“What is the highest item number?” SELECT MAX(article) AS article FROM shop; +---------+ | article | +---------+ | 4 | +---------+ .
https://dev.mysql.com/doc/refman/5.7/en/extensions-to-ansi.html
You can use standard system commands to back up, rename, move, delete, and copy tables that are managed by the MyISAM storage engine. For example, it is possible to rename a MyISAM table by renaming the .MYD, .MYI, and .frm files to which the table ... MySQL Server supports some extensions that are likely not to be found in other SQL ...
https://dev.mysql.com/doc/refman/5.7/en/alter-event.html
ALTER [DEFINER = user] EVENT event_name [ON SCHEDULE schedule] [ON COMPLETION [NOT] PRESERVE] [RENAME TO new_event_name] [ENABLE | DISABLE | DISABLE ON SLAVE] [COMMENT 'string'] [DO event_body] The ALTER EVENT statement changes one or more of the ...The syntax for each of the DEFINER, ON SCHEDULE, ON COMPLETION, COMMENT, ENABLE / DISABLE, and DO clauses is exactly the same as when used with CREATE ...
https://dev.mysql.com/doc/refman/5.7/en/delete.html
You need only the SELECT privilege for any columns that are only read, such as those named in the WHERE clause. Auto-Increment Columns If you delete the row containing the maximum value for an AUTO_INCREMENT column, the value is not reused for a ...