SHOW CREATE TABLE
Syntax
SHOW CREATE TABLE tbl_name
Description
Shows the CREATE TABLE statement that created the given table. The statement requires the SELECT privilege for the table. This statement also works with views and SEQUENCE.
SHOW CREATE TABLE
quotes table and column names according to the value of the sql_quote_show_create server system variable.
Certain SQL_MODE values can result in parts of the original CREATE statement not being included in the output. MariaDB-specific table options, column options, and index options are not included in the output of this statement if the NO_TABLE_OPTIONS, NO_FIELD_OPTIONS and NO_KEY_OPTIONS SQL_MODE flags are used. All MariaDB-specific table attributes are also not shown when a non-MariaDB/MySQL emulation mode is used, which includes ANSI, DB2, POSTGRESQL, MSSQL, MAXDB or ORACLE.
Invalid table options, column options and index options are normally commented out (note, that it is possible to create a table with invalid options, by altering a table of a different engine, where these options were valid). To have them uncommented, enable the IGNORE_BAD_TABLE_OPTIONS SQL_MODE. Remember that replaying a CREATE TABLE statement with uncommented invalid options will fail with an error, unless the IGNORE_BAD_TABLE_OPTIONS SQL_MODE is in effect.
Note that SHOW CREATE TABLE
is not meant to provide metadata about a table. It provides information about how the table was declared, but the real table structure could differ a bit. For example, if an index has been declared as HASH
, the CREATE TABLE
statement returned by SHOW CREATE TABLE
will declare that index as HASH
; however, it is possible that the index is in fact a BTREE
, because the storage engine does not support HASH
.
MariaDB 10.2.1 permits TEXT and BLOB data types to be assigned a DEFAULT value. As a result, from MariaDB 10.2.1, SHOW CREATE TABLE
will append a DEFAULT NULL
to nullable TEXT or BLOB fields if no specific default is provided.
From MariaDB 10.2.2, numbers are no longer quoted in the DEFAULT
clause in SHOW CREATE
statement. Previously, MariaDB quoted numbers.
Examples
SHOW CREATE TABLE t\G *************************** 1. row *************************** Table: t Create Table: CREATE TABLE `t` ( `id` int(11) NOT NULL AUTO_INCREMENT, `s` char(60) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1
With sql_quote_show_create off:
SHOW CREATE TABLE t\G *************************** 1. row *************************** Table: t Create Table: CREATE TABLE t ( id int(11) NOT NULL AUTO_INCREMENT, s char(60) DEFAULT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1
Unquoted numeric DEFAULTs, from MariaDB 10.2.2:
CREATE TABLE td (link TINYINT DEFAULT 1); SHOW CREATE TABLE td\G *************************** 1. row *************************** Table: td Create Table: CREATE TABLE `td` ( `link` tinyint(4) DEFAULT 1 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
Quoted numeric DEFAULTs, until MariaDB 10.2.1:
CREATE TABLE td (link TINYINT DEFAULT 1); SHOW CREATE TABLE td\G *************************** 1. row *************************** Table: td Create Table: CREATE TABLE `td` ( `link` tinyint(4) DEFAULT '1' ) ENGINE=InnoDB DEFAULT CHARSET=latin1
SQL_MODE impacting the output:
SELECT @@sql_mode; +-------------------------------------------------------------------------------------------+ | @@sql_mode | +-------------------------------------------------------------------------------------------+ | STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | +-------------------------------------------------------------------------------------------+ CREATE TABLE `t1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `msg` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 ; SHOW CREATE TABLE t1\G *************************** 1. row *************************** Table: t1 Create Table: CREATE TABLE `t1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `msg` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 SET SQL_MODE=ORACLE; SHOW CREATE TABLE t1\G *************************** 1. row *************************** Table: t1 Create Table: CREATE TABLE "t1" ( "id" int(11) NOT NULL, "msg" varchar(100) DEFAULT NULL, PRIMARY KEY ("id")
See Also
© 2021 MariaDB
Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/show-create-table/