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Search Results
https://dev.mysql.com/doc/refman/5.7/en/example-foreign-keys.html
MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent. A foreign key relationship involves a parent table that holds the initial column ...
https://dev.mysql.com/doc/refman/5.7/en/example-maximum-row.html
Task: Find the number, dealer, and price of the most expensive article.
https://dev.mysql.com/doc/refman/5.7/en/exists-and-not-exists-subqueries.html
For the preceding example, if t2 contains any rows, even rows with nothing but NULL values, the EXISTS condition is TRUE. If a subquery returns any rows at all, EXISTS subquery is TRUE, and NOT EXISTS subquery is FALSE. For example: SELECT column1 ...
https://dev.mysql.com/doc/refman/5.7/en/extensions-to-ansi.html
MySQL Server supports some extensions that are likely not to be found in other SQL DBMSs. Be warned that if you use them, your code is not portable to other SQL servers. For example, MySQL Server recognizes the STRAIGHT_JOIN keyword in the ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-cjk.html
This set of Frequently Asked Questions derives from the experience of MySQL's Support and Development groups in handling many inquiries about CJK (Chinese-Japanese-Korean) issues. What problems should I be aware of when working with the Big5 ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-boolean.html
MySQL can perform boolean full-text searches using the IN BOOLEAN MODE modifier. With this modifier, certain characters have special meaning at the beginning or end of words in the search string. In the following query, the + and - operators ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-stopwords.html
The stopword list is loaded and searched for full-text queries using the server character set and collation (the values of the character_set_server and collation_server system variables). False hits or misses might occur for stopword lookups if the ...
https://dev.mysql.com/doc/refman/5.7/en/function-optimization.html
A function is nondeterministic if, given fixed values for its arguments, it can return different results for different invocations. If a function is tagged nondeterministic, a reference to it in a WHERE clause is evaluated for every row (when ...
https://dev.mysql.com/doc/refman/5.7/en/gis-class-geometry.html
Exterior, interior, and boundary of an empty geometry are not defined (that is, they are represented by a NULL value). It is a noninstantiable class but has a number of properties, described in the following list, that are common to all geometry ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-launching.html
It should show something like this: mysql> SHOW PLUGINS; +----------------------------+----------+--------------------+----------------------+-------------+ | Name | Status | Type | Library | License | ... It is first necessary to ensure that the ...