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Hypolite Petovan 2018-01-17 15:31:25 -05:00
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doc/readme.md
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Friendica Documentation and Resources
=====================================
**Contents**
* General functions - first steps
* [Account Basics](help/Account-Basics)
* [New User Quick Start](help/Quick-Start-guide)
* [Creating posts](help/Text_editor)
* [BBCode tag reference](help/BBCode)
* [Comment, sort and delete posts](help/Text_comment)
* [Profiles](help/Profiles)
* You and other user
* [Connectors](help/Connectors)
* [Making Friends](help/Making-Friends)
* [Groups and Privacy](help/Groups-and-Privacy)
* [Tags and Mentions](help/Tags-and-Mentions)
* [Community Forums](help/Forums)
* [Chats](help/Chats)
* Further information
* [Improve Performance](help/Improve-Performance)
* [Move Account](help/Move-Account)
* [Remove Account](help/Remove-Account)
* [Bugs and Issues](help/Bugs-and-Issues)
* [Frequently asked questions (FAQ)](help/FAQ)
**Technical Documentation**
* [Install](help/Install)
* [Settings & Admin Panel](help/Settings)
* [Plugins](help/Plugins)
* [Installing Connectors (Twitter/GNU Social)](help/Installing-Connectors)
* [Install an ejabberd server (XMPP chat) with synchronized credentials](help/install-ejabberd)
* [Message Flow](help/Message-Flow)
* [Using SSL with Friendica](help/SSL)
* [Developers](help/Developers)
* [Twitter/GNU Social API Functions](help/api)
* [Translation of Friendica](help/translations)
**External Resources**
* [Main Website](https://friendi.ca)
* [Mailing List Archive](http://librelist.com/browser/friendica/)
**About**
* [Site/Version Info](friendica)

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# Considerations before upgrading Friendica
* [Home](help)
## MySQL >= 5.7.4
Starting from MySQL version 5.7.4, the IGNORE keyword in ALTER TABLE statements is ignored.
This prevents automatic table deduplication if a UNIQUE index is added to a Friendica table's structure.
If a DB update fails for you while creating a UNIQUE index, make sure to manually deduplicate the table before trying the update again.
### Manual deduplication
There are two main ways of doing it, either by manually removing the duplicates or by recreating the table.
Manually removing the duplicates is usually faster if they're not too numerous.
To manually remove the duplicates, you need to know the UNIQUE index columns available in `database.sql`.
```SQL
SELECT GROUP_CONCAT(id), <index columns>, count(*) as count FROM users
GROUP BY <index columns> HAVING count >= 2;
/* delete or merge duplicate from above query */;
```
If there are too many rows to handle manually, you can create a new table with the same structure as the table with duplicates and insert the existing content with INSERT IGNORE.
To recreate the table you need to know the table structure available in `database.sql`.
```SQL
CREATE TABLE <table_name>_new <rest of the CREATE TABLE>;
INSERT IGNORE INTO <table_name>_new SELECT * FROM <table_name>;
DROP TABLE <table_name>;
RENAME TABLE <table_name>_new TO <table_name>;
```
This method is slower overall, but it is better suited for large numbers of duplicates.