Basic Data Types

Overview

MySQL supports a number of basic data types, including numeric, date/time, string (character), LOB, set, binary, and Boolean types. GaussDB(DWS) does not support some basic MySQL data types, precision settings of some MySQL data types, or some MySQL keywords such as UNSIGNED and ZEROFILL. DSC performs migration based on GaussDB support.

A data type is a basic data attribute. Occupied storage space and allowed operations vary according to data types. In a database, data is stored in tables, in which a data type is specified for each column. Data in the column must be of its allowed data type. For details of each types description, see Table 1

Numeric Types

Input: TINYINT

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` TINYINT,
    `dataType_2` TINYINT(0),
    `dataType_3` TINYINT(255),
    `dataType_4` TINYINT(255) UNSIGNED ZEROFILL,
    `dataType_5` TINYINT(255) ZEROFILL
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" TINYINT,
  "datatype_2" TINYINT,
  "datatype_3" TINYINT,
  "datatype_4" SMALLINT,
  "datatype_5" TINYINT
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Date/Time Types

The value of fsp must be in the range [0, 6]. Value 0 indicates no decimal. If this parameter is omitted, the default precision will be 0.

Input: DATETIME

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` DATETIME,
    `dataType_2` DATETIME(0),
    `dataType_3` DATETIME(6),
    `dataType_4` DATETIME DEFAULT NULL,
    `dataType_5` DATETIME DEFAULT '2018-10-12 15:27:33.999999'
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" TIMESTAMP WITHOUT TIME ZONE,
  "datatype_2" TIMESTAMP(0) WITHOUT TIME ZONE,
  "datatype_3" TIMESTAMP(6) WITHOUT TIME ZONE,
  "datatype_4" TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
  "datatype_5" TIMESTAMP WITHOUT TIME ZONE DEFAULT '2018-10-12 15:27:33.999999'
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Input: TIME

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` TIME DEFAULT '20:58:10',
    `dataType_2` TIME(3) DEFAULT '20:58:10',
    `dataType_3` TIME(6) DEFAULT '20:58:10',
    `dataType_4` TIME(6) DEFAULT '2018-10-11 20:00:00',
    `dataType_5` TIME(6) DEFAULT '20:58:10.01234',
    `dataType_6` TIME(6) DEFAULT '2018-10-11 20:00:00.01234',
    `dataType_7` TIME DEFAULT NULL,
    `dataType_8` TIME(6) DEFAULT NULL,
    PRIMARY KEY (dataType_1)
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" TIME WITHOUT TIME ZONE DEFAULT '20:58:10',
  "datatype_2" TIME(3) WITHOUT TIME ZONE DEFAULT '20:58:10',
  "datatype_3" TIME(6) WITHOUT TIME ZONE DEFAULT '20:58:10',
  "datatype_4" TIME(6) WITHOUT TIME ZONE DEFAULT '2018-10-11 20:00:00',
  "datatype_5" TIME(6) WITHOUT TIME ZONE DEFAULT '20:58:10.01234',
  "datatype_6" TIME(6) WITHOUT TIME ZONE DEFAULT '2018-10-11 20:00:00.01234',
  "datatype_7" TIME WITHOUT TIME ZONE DEFAULT NULL,
  "datatype_8" TIME(6) WITHOUT TIME ZONE DEFAULT NULL,
  PRIMARY KEY ("datatype_1")
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Input: TIMESTAMP

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
   `dataType_1` TIMESTAMP,
   `dateType_4` TIMESTAMP DEFAULT '2018-10-12 15:27:33',
   `dateType_5` TIMESTAMP DEFAULT '2018-10-12 15:27:33.999999',
   `dateType_6` TIMESTAMP DEFAULT '2018-10-12 15:27:33',
   `dateType_7` TIMESTAMP DEFAULT '2018-10-12 15:27:33',
   `dataType_8` TIMESTAMP(0) DEFAULT '2018-10-12 15:27:33',
   `dateType_9` TIMESTAMP(6) DEFAULT '2018-10-12 15:27:33'
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" TIMESTAMP WITH TIME ZONE,
  "datetype_4" TIMESTAMP WITH TIME ZONE DEFAULT '2018-10-12 15:27:33',
  "datetype_5" TIMESTAMP WITH TIME ZONE DEFAULT '2018-10-12 15:27:33.999999',
  "datetype_6" TIMESTAMP WITH TIME ZONE DEFAULT '2018-10-12 15:27:33',
  "datetype_7" TIMESTAMP WITH TIME ZONE DEFAULT '2018-10-12 15:27:33',
  "datatype_8" TIMESTAMP(0) WITH TIME ZONE DEFAULT '2018-10-12 15:27:33',
  "datetype_9" TIMESTAMP(6) WITH TIME ZONE DEFAULT '2018-10-12 15:27:33'
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Input: YEAR

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` YEAR,
    `dataType_2` YEAR(4),
    `dataType_3` YEAR DEFAULT '2018',
    `dataType_4` TIME DEFAULT NULL
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" VARCHAR(4),
  "datatype_2" VARCHAR(4),
  "datatype_3" VARCHAR(4) DEFAULT '2018',
  "datatype_4" TIME WITHOUT TIME ZONE DEFAULT NULL 
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

String Types

Input: CHAR

In MySQL, the length of a CHAR column is fixed to the length that you declare when you create the table. The length can be any value from 0 to 255. When CHAR values are stored, they are right-padded with spaces to the specified length.

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
   `dataType_1` CHAR NOT NULL,
   `dataType_2` CHAR(0) NOT NULL,
   `dataType_3` CHAR(255) NOT NULL
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" CHAR NOT NULL,
  "datatype_2" CHAR(1) NOT NULL,
  "datatype_3" CHAR(255) NOT NULL
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Input: [LONG|MEDIUM|TINY]TEXT

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` LONGTEXT,
    `dataType_2` MEDIUMTEXT,
    `dataType_3` TEXT,
    `dataType_4` TINYTEXT
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" TEXT,
  "datatype_2" TEXT,
  "datatype_3" TEXT,
  "datatype_4" TEXT
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Input: VARCHAR

In MySQL, values in VARCHAR columns are variable-length strings. The length can be any value from 0 to 65,535.

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` VARCHAR(0),
    `dataType_2` VARCHAR(1845)
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" VARCHAR(1),
  "datatype_2" VARCHAR(1845)
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Spatial Data Types

• GEOMETRY can store geometry values of any type. The other single-value types (POINT, LINESTRING, and POLYGON) restrict their values to a particular geometry type.
• GEOMETRYCOLLECTION can store a collection of objects of any type. The other collection types (MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, and GEOMETRYCOLLECTION) restrict collection members to those having a particular geometry type.

  Input

  CREATE TABLE `t_geo_test2`  (
    `id` int(11) NOT NULL,
    `name` varchar(255),
    `geometry_1` geometry NOT NULL,
    `point_1` point NOT NULL,
    `linestring_1` linestring NOT NULL,
    `polygon_1` polygon NOT NULL,
    `multipoint_1` multipoint NOT NULL,
    `multilinestring_1` multilinestring NOT NULL,
    `multipolygon_1` multipolygon NOT NULL,
    `geometrycollection_1` geometrycollection NOT NULL,
    PRIMARY KEY (`id`) USING BTREE
  ) ENGINE = InnoDB;

  Output

  CREATE TABLE "public"."t_geo_test2"
  (
    "id" INTEGER(11) NOT NULL,
    "name" VARCHAR(255),
    "geometry_1" CIRCLE NOT NULL,
    "point_1" POINT NOT NULL,
    "linestring_1" POLYGON NOT NULL,
    "polygon_1" POLYGON NOT NULL,
    "multipoint_1" BOX NOT NULL,
    "multilinestring_1" BOX NOT NULL,
    "multipolygon_1" POLYGON NOT NULL,
    "geometrycollection_1" CIRCLE NOT NULL,
    PRIMARY KEY ("id")
  )
    WITH ( ORIENTATION = ROW, COMPRESSION = NO )
    NOCOMPRESS
    DISTRIBUTE BY HASH ("id");

LOB Types

Input: [TINY|MEDIUM|LONG]BLOB

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` BIGINT,
    `dataType_2` TINYBLOB,
    `dataType_3` BLOB,
    `dataType_4` MEDIUMBLOB,
    `dataType_5` LONGBLOB
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" BIGINT,
  "datatype_2" BLOB,
  "datatype_3" BLOB,
  "datatype_4" BLOB,
  "datatype_5" BLOB
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Set Types

Input: ENUM

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
     id   int(2) PRIMARY KEY,
    `dataType_17` ENUM('dws-1', 'dws-2', 'dws-3')
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "id" INTEGER(2) PRIMARY KEY,
  "datatype_17" VARCHAR(14)
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("id");

Input: SET

CREATE TABLE IF NOT EXISTS `runoob_tbl_test`(
    `dataType_18` SET('dws-1', 'dws-2', 'dws-3')
);

Output

CREATE TABLE "public"."runoob_tbl_test"
(
  "datatype_18" VARCHAR(14)
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_18");

Boolean Types

Input: BOOL/BOOLEAN

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` INT,
    `dataType_2` BOOL,
    `dataType_3` BOOLEAN
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" INTEGER,
  "datatype_2" BOOLEAN,
  "datatype_3" BOOLEAN
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Binary Types

Input: BIT

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` INT,
    `dataType_2` BIT(1),
    `dataType_3` BIT(64)
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" INTEGER,
  "datatype_2" BIT(1),
  "datatype_3" BIT(64)
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");

Input: [VAR]BINARY

CREATE TABLE IF NOT EXISTS `runoob_dataType_test`(
    `dataType_1` INT,
    `dataType_2` BINARY,
    `dataType_3` BINARY(0),
    `dataType_4` BINARY(255),
    `dataType_5` VARBINARY(0),
    `dataType_6` VARBINARY(6553)
);

Output

CREATE TABLE "public"."runoob_datatype_test"
(
  "datatype_1" INTEGER,
  "datatype_2" BYTEA,
  "datatype_3" BYTEA,
  "datatype_4" BYTEA,
  "datatype_5" BYTEA,
  "datatype_6" BYTEA
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("datatype_1");