描述

该语句用来在数据库中创建一张新表。

格式

CREATE [GLOBAL TEMPORARY] TABLE table_name
      (table_definition_list) [table_option_list] [partition_option] [on_commit_option]
CREATE [GLOBAL TEMPORARY] TABLE table_name
      (table_definition_list) [table_option_list] [partition_option] [AS] select;
table_definition_list:
    table_definition [, table_definition ...]
table_definition:
      column_definition
    | INDEX [index_name] index_desc
    | [CONSTRAINT [constraint_name]] [PRIMARY KEY|UNIQUE]  (column_desc_list) [USING INDEX index_option_list]
    | [CONSTRAINT [constraint_name]] FOREIGN KEY (column_name, column_name ...) references_clause constranit_state
    | [CONSTRAINT [constraint_name]] CHECK(expression) constranit_state
column_definition_list:
    column_definition [, column_definition ...]
column_definition:
    column_name data_type
    [VISIBLE|INVISIBLE]
    {
    [DEFAULT expression]
    [NULL | NOT NULL] 
    [CONSTRAINT [constraint_name] [PRIMARY] KEY] [UNIQUE [KEY]]
    [CONSTRAINT [constraint_name] CHECK(expression) constranit_state]
    [CONSTRAINT [constraint_name] references_clause
    |
    [GENERATED ALWAYS] AS (expression) [VIRTUAL]
    [NULL | NOT NULL] [UNIQUE KEY] [[PRIMARY] KEY] [UNIQUE LOWER_KEY] [COMMENT string]
    }
references_clause:
     REFERENCES table_name (column_name, column_name ...) [ON DELETE {CASCADE|SET NULL}]] 
constranit_state:
    [RELY|NORELY] [USING INDEX index_option_list] [ENABLE|DISABLE] [VALIDATE|NOVALIDATE]
index_desc:
   (column_desc_list) [index_option_list]
column_desc_list:
    column_desc [, column_desc ...]
column_desc:
     column_name [ASC | DESC][NULL LAST|NULL FIRST]
index_option_list:
    index_option [ index_option ...]
index_option:
      [GLOBAL | LOCAL]
    | block_size
    | compression
    | STORING(column_name_list)
    | comment
table_option_list:
    table_option [ table_option ...]
table_option:
    primary_zone
    | replica_num
    | table_tablegroup
    | block_size
    | compression
    | comment
    | DUPLICATE_SCOPE [=] "none|zone|region|cluster"
    | LOCALITY [=] "locality description"
    | ENABLE ROW MOVEMENT
    | DISABLE ROW MOVEMENT
    | physical_attribute
physical_attribute_list:
    physical_attribute [physical_attribute]
physical_attribute:
    PCTFREE [=] num
    | PCTUSED num
    | INITRANS num
    | MAXTRANS num
    | STORAGE(storage_option [storage_option] ...)
    | TABLESPACE tablespace
compression:
    NOCOMPRESS
    | COMPRESS { BASIC | FOR OLTP | FOR QUERY [LOW|HIGH]  | FOR ARCHIVE [LOW|HIGH]} 
storage_option:
    INITIAL_ num [K|M|G|T|P|E]
    | NEXT num [K|M|G|T|P|E]
    | MINEXTENTS num [K|M|G|T|P|E]
    | MAXEXTENTS num [K|M|G|T|P|E]
partition_option:
      PARTITION BY HASH(column_name_list)
      [subpartition_option] PARTITIONS partition_count [TABLESPACE tablespace] [compression]
    | PARTITION BY RANGE (column_name_list)
      [subpartition_option] (range_partition_list)
    | PARTITION BY LIST (column_name_list)
      [subpartition_option] (list_partition_list)
subpartition_option:
      SUBPARTITION BY HASH (column_name_list) SUBPARTITIONS subpartition_count
    | SUBPARTITION BY RANGE (column_name_list) SUBPARTITION TEMPLATE
      (range_subpartition_list)
    | SUBPARTITION BY LIST (column_name_list) SUBPARTITION TEMPLATE (list_subpartition_list)
range_partition_list:
    range_partition [, range_partition ...]
range_partition:
    PARTITION [partition_name]
    VALUES LESS THAN {(expression_list) | MAXVALUE} [ID = num] [physical_attribute_list] [compression]
range_subpartition_list:
    range_subpartition [, range_subpartition ...]
range_subpartition:
    SUBPARTITION subpartition_name
    VALUES LESS THAN {(expression_list) | MAXVALUE} [physical_attribute_list]
list_partition_list:
    list_partition [, list_partition] ...
list_partition:
    PARTITION [partition_name] VALUES (DEFAULT|expression_list) [ID num] [physical_attribute_list] [compression]
list_subpartition_list:
    list_subpartition [, list_subpartition] ...
list_subpartition:
    SUBPARTITION [partition_name] VALUES (DEFAULT|expression_list) [physical_attribute_list]
expression_list:
    expression [, expression ...]
column_name_list:
    column_name [, column_name ...]
partition_name_list:
    partition_name [, partition_name ...]
partition_count | subpartition_count:
    INT_VALUE
on_commit_option:
    ON COMMIT DELETE ROWS
    | ON COMMIT PRESERVE ROWS

参数说明

举例

• 创建数据库表。

CREATE TABLE test (c1 int primary key, c2 VARCHAR(50)) REPLICA_NUM = 3, PRIMARY_ZONE = 'zone1';

• 创建一个复制表。

CREATE TABLE item() locality = 'F,R{all_server}@hz1, F,R{all_server}@hz2, 
F,R{all_server}@hz3' DUPLICATE_SCOPE="cluster"

• 创建带索引的表。

create table t1 (c1 int primary key, c2 int, c3 int, index i1 (c2));

• 创建 hash 分区，分区数为 8 的表。

create table t1 (c1 int primary key, c2 int) partition by hash(c1) partitions 8;

• 创建一级分区为 range 分区，二级分区为 hash 分区的表。

 create table t1 (c1 int, c2 int, c3 int)
     partition by range(c1) subpartition by hash(c2) subpartitions 5
     (partition p0 values less than(0), partition p1 values less than(100));

• 开启 encoding 并使用 zstd 压缩，宏块保留空间为 5%。

create table t1 (c1 int, c2 int, c3 varchar(64))
  COMPRESS FOR ARCHIVE
  PCTFREE 5;

• 创建一个事务级临时表。

create global temporary table t1 (c1 int) on commit delete rows ;

• 创建一个带约束的表。

create table t1 (c1 int, c2 int, c3 int, CONSTRAINT equal_check CHECK(c2 = c3 * 2) ENABLE VALIDATE);