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https://dev.mysql.com/doc/refman/5.7/en/charset-collation-effect.html
The second column shows the result of the SELECT using the German DIN-1 rule, which says that U-umlaut sorts with U. The third column shows the result of the SELECT using the German DIN-2 rule, which says that U-umlaut sorts with UE.
https://dev.mysql.com/doc/refman/5.7/en/constraint-invalid-data.html
You can select stricter treatment of input values by using the STRICT_TRANS_TABLES or STRICT_ALL_TABLES SQL modes: SET sql_mode = 'STRICT_TRANS_TABLES'; SET sql_mode = 'STRICT_ALL_TABLES'; STRICT_TRANS_TABLES enables strict mode for transactional ...
https://dev.mysql.com/doc/refman/5.7/en/cursor-restrictions.html
In MySQL, a server-side cursor is materialized into an internal temporary table. Initially, this is a MEMORY table, but is converted to a MyISAM table when its size exceeds the minimum value of the max_heap_table_size and tmp_table_size system ...
https://dev.mysql.com/doc/refman/5.7/en/downgrade-troubleshooting.html
If you downgrade from one release series to another, there may be incompatibilities in table storage formats. In this case, use mysqldump to dump your tables before downgrading. After downgrading, reload the dump file using mysql or mysqlimport to ...For examples, see Section 2.10.13, “Copying MySQL Databases to Another ...
https://dev.mysql.com/doc/refman/5.7/en/encryption-functions.html
One way to make collisions detectable is to make the hash column a primary key. The alternative permitted block encryption modes CBC, CFB1, CFB8, CFB128, and OFB all require an initialization vector. Both HKDF and PBKDF2 can use salts, and their use ...If you want to store these results, use a column with a VARBINARY or BLOB binary string data ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-storage-engines.html
Where can I obtain complete documentation for MySQL storage engines? See Chapter 15, Alternative Storage Engines. The disabled_storage_engines configuration option defines which storage engines cannot be used to create tables or tablespaces. MySQL ...Where can I obtain complete documentation for MySQL storage engines? ...
https://dev.mysql.com/doc/refman/5.7/en/get-diagnostics.html
For example: mysql> GET DIAGNOSTICS CONDITION 1 @p5 = SCHEMA_NAME, @p6 = TABLE_NAME; mysql> SELECT @p5, @p6; +------+------+ | @p5 | @p6 | +------+------+ | | | +------+------+ In standard SQL, if there are multiple conditions, the first condition ... GET [CURRENT | STACKED] DIAGNOSTICS { statement_information_item [, statement_information_item] ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
To tell MySQL to accept the query, you can use the ANY_VALUE() function: SELECT name, ANY_VALUE(address), MAX(age) FROM t GROUP BY name; Alternatively, disable ONLY_FULL_GROUP_BY. SQL-92 and earlier does not permit queries for which the select ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-bootstrap.html
For the purpose of demonstrating that the server is indeed in a group and that it is able to handle load, create a table and add some content to it. mysql> CREATE DATABASE test; mysql> USE test; mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 TEXT ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-network-partitioning.html
Detecting Partitions The replication_group_members performance schema table presents the status of each server in the current view from the perspective of this server. The majority of the time the system does not run into partitioning, and therefore ... The group needs to achieve consensus whenever a change that needs to be replicated ...