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https://dev.mysql.com/doc/refman/8.4/en/range-optimization.html
Otherwise, any index on col_name is nonunique and the optimizer can estimate the row count for each range using dives into the index or index statistics. The idea is that if index use is forced, there is nothing to be gained from the additional ...
https://dev.mysql.com/doc/refman/8.4/en/join.html
This includes a join handled by merging derived tables and views in the FROM clause into the outer query block (see Section 10.2.2.4, “Optimizing Derived Tables, View References, and Common Table Expressions with Merging or Materialization”).
https://dev.mysql.com/doc/internals/en/mismatch-of-focus-of-test-and-code-sequence.html
CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, my_column VARCHAR(30), name LONGTEXT, PRIMARY KEY (id)); INSERT INTO t1(my_column,name) VALUES('2','two'); INSERT INTO t1(my_column,name) VALUES('1','one'); INSERT INTO t1(my_column,name) ...
https://dev.mysql.com/doc/heatwave/en/mys-hwaml-classification-overview.html
mysql> CREATE DATABASE classification_data; mysql> USE classification_data; Create the table to insert the sample data into. This topic describes how to prepare the data to use for a classification machine learning model. The classification ...
https://dev.mysql.com/doc/heatwave/en/mys-hwaml-preparing-a-recommendation-model.html
mysql> CREATE DATABASE recommendation_data; mysql> USE recommendation_data; Create the table to insert the sample data into. mysql> CREATE TABLE training_dataset ( user_id VARCHAR(3), item_id VARCHAR(3), rating DECIMAL(3, 1), PRIMARY KEY (user_id, ... This topic describes how to prepare the data to use for a recommendation machine learning model using explicit ...
https://dev.mysql.com/doc/heatwave/en/mys-hwaml-regression-prepare.html
mysql> CREATE DATABASE regression_data; mysql> USE regression_data; Create the table to insert the sample data into. mysql> CREATE TABLE house_price_training ( id INT PRIMARY KEY, house_size INT, address TEXT, state TEXT, price INT ); Insert the ...
https://dev.mysql.com/doc/refman/8.4/en/bit-functions.html
Table 14.17 Bit Functions and Operators Name Description & Bitwise AND >> Right shift << Left shift ^ Bitwise XOR BIT_COUNT() Return the number of bits that are set | Bitwise OR ~ Bitwise inversion The following list describes available bit ...
https://dev.mysql.com/doc/refman/8.4/en/ldml-collation-example.html
To add a UCA collation for a Unicode character set without recompiling MySQL, use the following procedure. If you are unfamiliar with the LDML rules used to describe the collation's sort characteristics, see Section 12.14.4.2, “LDML Syntax ...
https://dev.mysql.com/doc/refman/8.4/en/partitioning-hash.html
In addition, you most likely want to follow this with PARTITIONS num, where num is a positive integer representing the number of partitions into which the table is to be divided. You should also keep in mind that this expression is evaluated each ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-real-escape-string-quote.html
The string in the from argument is encoded to produce an escaped SQL string, taking into account the current character set of the connection. Return Values The length of the encoded string that is placed into the to argument, not including the ...