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https://dev.mysql.com/error-log-rule-based-filtering.html
Where applicable, symbolic values are preferable to numeric values for readability and portability. Error codes can be specified in numeric form or as the corresponding error symbol. Symbolic names can be specified as quoted strings for comparison ... The log_filter_dragnet log filter component enables log filtering based on user-defined ...
https://dev.mysql.com/hexadecimal-literals.html
In numeric contexts, MySQL treats a hexadecimal literal like a BIGINT (64-bit integer). To ensure numeric treatment of a hexadecimal literal, use it in numeric context. Due to the difference in result types, the displayed values differ: High-order 0 ... Hexadecimal literal values are written using X'val' or 0xval notation, where val contains hexadecimal digits (0..9, ...
https://dev.mysql.com/json.html
The following comparison operators and functions are not yet supported with JSON values: BETWEEN IN() GREATEST() LEAST() A workaround for the comparison operators and functions just listed is to cast JSON values to a native MySQL numeric or string ...The JSON data type provides these advantages over storing JSON-format strings in a string column: Automatic validation of JSON documents stored in JSON ...
https://dev.mysql.com/error-log-priority-based-filtering.html
A numeric code may be specified with or without the MY- prefix. Examples of permitted code formats: ER_SERVER_SHUTDOWN_COMPLETE MY-000031 000031 MY-31 31 Symbolic values are preferable to numeric values for readability and portability. Although ...
https://dev.mysql.com/insert.html
For the FLOAT and DECIMAL columns, the string-to-number conversion considers the entire string a valid numeric value. This is 0 for numeric types, the empty string ('') for string types, and the “zero” value for date and time types. Instead, the ... INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] {VALUES | VALUE} (value_list) [, (value_list)] ...
https://dev.mysql.com/set.html
MySQL stores SET values numerically, with the low-order bit of the stored value corresponding to the first set member. If you retrieve a SET value in a numeric context, the value retrieved has bits set corresponding to the set members that make up ... A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is ...
https://dev.mysql.com/string-functions.html
ASCII(str) Returns the numeric value of the leftmost character of the string str. A numeric argument is converted to its equivalent nonbinary string form. For a numeric argument N, HEX() returns a hexadecimal string representation of the value of N ...For functions that operate on string positions, the first position is numbered ...
https://dev.mysql.com/audit-log-filter-definitions.html
Table 6.32 audit_log_connection_policy_value Values Value Corresponding audit_log_connection_policy Value 0 or "::none" NONE 1 or "::errors" ERRORS 2 or "::all" ALL The "::xxx" values are symbolic pseudo-constants that may be given instead of the ...
https://dev.mysql.com/constraint-invalid-data.html
If you try to store a string that does not start with a number into a numeric column, MySQL Server stores 0. In general, this is 0 for numeric types, the empty string ('') for string types, and the “zero” value for date and time types. By ...
https://dev.mysql.com/converting-tables-to-innodb.html
Consider using an auto-increment column if there is not another stable, unique, non-null, numeric column to use. Use the smallest practical numeric type based on the maximum projected size of the table. If you do set up a numeric ID column for the ... If you have MyISAM tables that you want to convert to InnoDB for better reliability and scalability, review the following guidelines and tips before ...
Document created the 26/06/2006, last modified the 26/10/2018
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