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4246c0fa01
Two new information_schema views are added: * PERIOD table -- columns TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, PERIOD_NAME, START_COLUMN_NAME, END_COLUMN_NAME. * KEY_PERIOD_USAGE -- works similar to KEY_COLUMN_USAGE, but for periods. Columns CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME, TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, PERIOD_NAME Two new columns are added to the COLUMNS view: IS_SYSTEM_TIME_PERIOD_START, IS_SYSTEM_TIME_PERIOD_END - contain YES/NO.
111 lines
5.3 KiB
Text
111 lines
5.3 KiB
Text
USE test;
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1
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(
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f1 CHAR UNICODE,
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f2 CHAR(0) UNICODE,
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f3 CHAR(10) UNICODE,
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f5 VARCHAR(0) UNICODE,
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f6 VARCHAR(255) UNICODE,
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f7 VARCHAR(260) UNICODE,
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f8 TEXT UNICODE,
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f9 TINYTEXT UNICODE,
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f10 MEDIUMTEXT UNICODE,
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f11 LONGTEXT UNICODE
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) ENGINE = InnoDB;
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SELECT * FROM information_schema.columns
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WHERE table_schema LIKE 'test%'
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ORDER BY table_schema, table_name, column_name;
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TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION COLUMN_DEFAULT IS_NULLABLE DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE DATETIME_PRECISION CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE COLUMN_KEY EXTRA PRIVILEGES COLUMN_COMMENT IS_GENERATED GENERATION_EXPRESSION IS_SYSTEM_TIME_PERIOD_START IS_SYSTEM_TIME_PERIOD_END
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def test t1 f1 1 NULL YES char 1 2 NULL NULL NULL ucs2 ucs2_general_ci char(1) select,insert,update,references NEVER NULL NO NO
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def test t1 f10 9 NULL YES mediumtext 8388607 16777215 NULL NULL NULL ucs2 ucs2_general_ci mediumtext select,insert,update,references NEVER NULL NO NO
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def test t1 f11 10 NULL YES longtext 2147483647 4294967295 NULL NULL NULL ucs2 ucs2_general_ci longtext select,insert,update,references NEVER NULL NO NO
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def test t1 f2 2 NULL YES char 0 0 NULL NULL NULL ucs2 ucs2_general_ci char(0) select,insert,update,references NEVER NULL NO NO
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def test t1 f3 3 NULL YES char 10 20 NULL NULL NULL ucs2 ucs2_general_ci char(10) select,insert,update,references NEVER NULL NO NO
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def test t1 f5 4 NULL YES varchar 0 0 NULL NULL NULL ucs2 ucs2_general_ci varchar(0) select,insert,update,references NEVER NULL NO NO
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def test t1 f6 5 NULL YES varchar 255 510 NULL NULL NULL ucs2 ucs2_general_ci varchar(255) select,insert,update,references NEVER NULL NO NO
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def test t1 f7 6 NULL YES varchar 260 520 NULL NULL NULL ucs2 ucs2_general_ci varchar(260) select,insert,update,references NEVER NULL NO NO
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def test t1 f8 7 NULL YES text 32767 65535 NULL NULL NULL ucs2 ucs2_general_ci text select,insert,update,references NEVER NULL NO NO
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def test t1 f9 8 NULL YES tinytext 127 255 NULL NULL NULL ucs2 ucs2_general_ci tinytext select,insert,update,references NEVER NULL NO NO
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##########################################################################
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# Show the quotient of CHARACTER_OCTET_LENGTH and CHARACTER_MAXIMUM_LENGTH
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##########################################################################
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SELECT DISTINCT
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CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
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DATA_TYPE,
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CHARACTER_SET_NAME,
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COLLATION_NAME
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FROM information_schema.columns
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WHERE table_schema LIKE 'test%'
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AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH = 1
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ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
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COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
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Warnings:
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Warning 1365 Division by 0
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Warning 1365 Division by 0
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SELECT DISTINCT
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CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
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DATA_TYPE,
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CHARACTER_SET_NAME,
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COLLATION_NAME
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FROM information_schema.columns
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WHERE table_schema LIKE 'test%'
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AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH <> 1
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ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
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COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
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2.0000 char ucs2 ucs2_general_ci
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2.0000 longtext ucs2 ucs2_general_ci
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2.0000 mediumtext ucs2 ucs2_general_ci
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2.0000 text ucs2 ucs2_general_ci
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2.0000 varchar ucs2 ucs2_general_ci
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2.0079 tinytext ucs2 ucs2_general_ci
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Warnings:
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Warning 1365 Division by 0
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Warning 1365 Division by 0
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SELECT DISTINCT
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CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
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DATA_TYPE,
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CHARACTER_SET_NAME,
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COLLATION_NAME
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FROM information_schema.columns
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WHERE table_schema LIKE 'test%'
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AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH IS NULL
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ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
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COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
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NULL char ucs2 ucs2_general_ci
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NULL varchar ucs2 ucs2_general_ci
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Warnings:
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Warning 1365 Division by 0
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Warning 1365 Division by 0
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Warning 1365 Division by 0
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Warning 1365 Division by 0
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--> CHAR(0) is allowed (see manual), and here both CHARACHTER_* values
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--> are 0, which is intended behavior, and the result of 0 / 0 IS NULL
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SELECT CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
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TABLE_SCHEMA,
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TABLE_NAME,
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COLUMN_NAME,
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DATA_TYPE,
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CHARACTER_MAXIMUM_LENGTH,
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CHARACTER_OCTET_LENGTH,
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CHARACTER_SET_NAME,
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COLLATION_NAME,
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COLUMN_TYPE
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FROM information_schema.columns
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WHERE table_schema LIKE 'test%'
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ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION;
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COL_CML TABLE_SCHEMA TABLE_NAME COLUMN_NAME DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE
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2.0000 test t1 f1 char 1 2 ucs2 ucs2_general_ci char(1)
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NULL test t1 f2 char 0 0 ucs2 ucs2_general_ci char(0)
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2.0000 test t1 f3 char 10 20 ucs2 ucs2_general_ci char(10)
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NULL test t1 f5 varchar 0 0 ucs2 ucs2_general_ci varchar(0)
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2.0000 test t1 f6 varchar 255 510 ucs2 ucs2_general_ci varchar(255)
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2.0000 test t1 f7 varchar 260 520 ucs2 ucs2_general_ci varchar(260)
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2.0000 test t1 f8 text 32767 65535 ucs2 ucs2_general_ci text
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2.0079 test t1 f9 tinytext 127 255 ucs2 ucs2_general_ci tinytext
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2.0000 test t1 f10 mediumtext 8388607 16777215 ucs2 ucs2_general_ci mediumtext
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2.0000 test t1 f11 longtext 2147483647 4294967295 ucs2 ucs2_general_ci longtext
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Warnings:
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Warning 1365 Division by 0
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Warning 1365 Division by 0
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DROP TABLE t1;
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