I have recently started to understand and become an experienced user in Microsoft SQL 2014, and now there was such a difficulty that I could not figure out myself. For certain needs, I converted the data into mdf format. I crashed while working, and now I can not extract a piece of material. There was some error in correlating the SQL Server table. How would I extract the data as soon as possible?

Only in case neither blogs nor articles and guides can't solve your issue, you may apply restore mysql database windows tool because it was created only for very complicated cases.

This one method is also effective, take a look - https://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html

It is the most effective manual guide, from here: http://www.databasejournal.com/features/mysql/article.php/10897_3300511_2/Repairing-Database-Corruption-in-MySQL.htm or http://www.mssqlserver.repair/

Repairing tables

In most cases, only the index will be corrupted (the index is a separate, smaller, file with records that point to the main data file) - actual data corruption is extremely rare. Fixing most forms of corruption is relatively easy. As with checking, there are three ways to repair tables. These all only work with MyISAM tables - to repair sql database of the other table types, you will need to restore from backup:
- The REPAIR TABLE SQL statement (obviously the server must be running for this)
- The mysqlcheck command-line utility (the server can be running)
- The myisamchk command-line utility (the server must be down, or the tables inactive)
Repairing a table requires twice as much disk space as the original table (a copy of the data is made), so make sure you are not going to run out of disk space before you start.

Hi,

You, can fix SQL database, with the help of a reliable tool, as apart from fixing errors. You, can resolve several other issues present in MS SQL Server database. Some, of the issues which it fixes are as follows:

1. Complete solution for SQL Server ROW and Page-compression.

2. Runs in all SQL versions.

3. Fixes MDF as well as NDF files.

4. Deals with every level of corruption.

http://www.databasefilerecovery.com/ms-sql-database-recovery.html

There is no chance of alternation in your recovered output.