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https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
That is, the number of indexed characters if the column is only partly indexed, NULL if the entire column is indexed. However, prefix lengths for index specifications in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements are interpreted as ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-table-constraints-table.html
The TABLE_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The name of the catalog to which the constraint belongs. CONSTRAINT_SCHEMA The name of the schema (database) to which the constraint belongs. TABLE_SCHEMA The name of the schema ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-autocommit-commit-rollback.html
$> mysql test mysql> CREATE TABLE customer (a INT, b CHAR (20), INDEX (a)); Query OK, 0 rows affected (0.00 sec) mysql> -- Do a transaction with autocommit turned on. If autocommit mode is enabled, each SQL statement forms a single transaction on ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-fulltext-index.html
Full-text indexes are created on text-based columns (CHAR, VARCHAR, or TEXT columns) to speed up queries and DML operations on data contained within those columns. The words are fully sorted and partitioned among the six index tables based on the ...A full-text index is defined as part of a CREATE TABLE statement or added to an existing table using ALTER TABLE or CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/insert.html
Inserting a string into a string column (CHAR, VARCHAR, TEXT, or BLOB) that exceeds the column maximum length. INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name ...
https://dev.mysql.com/doc/refman/8.0/en/internal-temporary-tables.html
Presence of any string column with a maximum length larger than 512 (bytes for binary strings, characters for nonbinary strings) in the SELECT list, if UNION or UNION ALL is used. The TempTable storage engine provides efficient storage for VARCHAR ... In some cases, the server creates internal temporary tables while processing ...
https://dev.mysql.com/doc/refman/8.0/en/json-attribute-functions.html
The functions in this section return attributes of JSON values. An error occurs if the argument is not a valid JSON document. An empty array, empty object, or scalar value has depth 1. A nonempty array containing only elements of depth 1 or ...
https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html
JSON_SEARCH(json_doc, one_or_all, search_str[, escape_char[, path] ...]) Returns the path to the given string within a JSON document. An error occurs if the json_doc argument is not a valid JSON document, any path argument is not a valid path ...
https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html
This section contains information about JSON functions that convert JSON data to tabular data. JSON_TABLE(expr, path COLUMNS (column_list) [AS] alias) Extracts data from a JSON document and returns it as a relational table having the specified ...
https://dev.mysql.com/doc/refman/8.0/en/json.html
The update can use nested calls to any of the functions listed in the previous item, in any combination, as long as the input and target columns are the same. MySQL handles strings used in JSON context using the utf8mb4 character set and utf8mb4_bin ...The JSON data type provides these advantages over storing JSON-format strings in a string column: Automatic validation of JSON documents stored in JSON ...