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https://dev.mysql.com/doc/refman/8.0/en/local-variable-scope.html
The scope of a local variable is the BEGIN ... The variable can be referred to in blocks nested within the declaring block, except those blocks that declare a variable with the same name. Because local variables are in scope only during stored ...
https://dev.mysql.com/doc/refman/8.0/en/load-data.html
For TINYINT, SMALLINT, MEDIUMINT, INT, and BIGINT, the field widths are 4, 6, 8, 11, and 20, respectively, no matter what the declared display width is. The file can be read from the server host or the client host, depending on whether the LOCAL ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
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/flow-control-functions.html
Otherwise, the result is an integer type (with one exception): If all integer types are all signed or all unsigned, the result is the same sign and the precision is the highest of all specified integer types (that is, TINYINT, SMALLINT, MEDIUMINT, ...The second syntax returns the result for the first condition that is ...
https://dev.mysql.com/doc/refman/8.0/en/enum.html
An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. See Section 13.3.1, “String Data Type Syntax” for ENUM type syntax and length ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-select.html
You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; MySQL creates new columns for all elements in the SELECT. For example: mysql> CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/converting-tables-to-innodb.html
For the ranges of the different integer types, see Section 13.1.2, “Integer Types (Exact Value) - INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT”. If you have MyISAM tables that you want to convert to InnoDB for better reliability and ...
https://dev.mysql.com/doc/refman/8.0/en/compressed-format.html
For example, a BIGINT column (eight bytes) can be stored as a TINYINT column (one byte) if all its values are in the range from -128 to 127. Compressed storage format is a read-only format that is generated with the myisampack tool. Compressed ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table-generated-columns.html
CREATE TABLE t1 (c1 INT, c2 INT GENERATED ALWAYS AS (c1 + 1) STORED); ALTER TABLE t1 MODIFY COLUMN c2 TINYINT GENERATED ALWAYS AS (c1 + 5) STORED; Generated columns can be renamed or dropped, if no other column refers to them. ALTER TABLE ...
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