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https://dev.mysql.com/doc/refman/8.4/en/fixed-point-types.html
The DECIMAL and NUMERIC types store exact numeric data values. These types are used when it is important to preserve exact precision, for example with monetary data. In MySQL, NUMERIC is implemented as DECIMAL, so the following remarks about ...
https://dev.mysql.com/doc/refman/8.4/en/flow-control-functions.html
If expr2 and expr3 are both strings, the result is case-sensitive if either string is case-sensitive. The second syntax returns the result for the first condition that is true. If no comparison or condition is true, the result after ELSE is ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/en/fulltext-fine-tuning.html
You can exert more control over full-text searching behavior if you have a MySQL source distribution because some changes require source code modifications. Modifying the default behavior in most cases can actually decrease effectiveness. Do not ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-natural-language.html
Note The term “document” may be used interchangeably with the term “row”, and both terms refer to the indexed part of the row. By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() function performs a natural language search ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-search-mecab.html
The built-in MySQL full-text parser uses the white space between words as a delimiter to determine where words begin and end, which is a limitation when working with ideographic languages that do not use word delimiters. To address this limitation ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/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/8.4/en/generated-column-index-optimizations.html
For example: CREATE TABLE t1 (f1 INT, gc INT AS (f1 + 1) STORED, INDEX (gc)); The generated column, gc, is defined as the expression f1 + 1. The column is also indexed and the optimizer can take that index into account during execution plan ...
https://dev.mysql.com/doc/refman/8.4/en/gis-class-linestring.html
A LineString is a LinearRing if it is both closed and simple. A LineString is a Curve with linear interpolation between points. LineString Examples On a world map, LineString objects could represent rivers. LineString Properties A LineString has ...