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更新时间：2024-12-10 GMT+08:00
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索引

CREATE TABLE语句支持创建索引。DSC支持带有主索引（PRIMARY INDEX）和唯一索引（UNIQUE INDEX）的TABLE语句。

该工具不会添加DISTRIBUTE BY HASH用于创建具有主键（PRIMARY KEY）和非唯一主索引的表。

输入：CREATE TABLE，使用INDEX

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CREATE SET TABLE DP_TEDW.B0381_ACCOUNT_OBTAINED_MAP,
      NO FALLBACK, NO BEFORE JOURNAL,      
      NO AFTER JOURNAL, CHECKSUM = DEFAULT      
 ( Ranked_Id            INTEGER  NOT NULL
 , Source_System_Code   SMALLINT NOT NULL
 , Operational_Acc_Obtained_Id VARCHAR(100) 
   CHARACTER SET LATIN NOT CASESPECIFIC FORMAT 'X(50)'
 , Mapped_Id               INTEGER  NOT NULL
 ) 
PRIMARY INDEX B0381_ACCOUNT_OBTAINED_idx_PR ( Ranked_Id ) 
UNIQUE INDEX B0381_ACCT_OBT_MAP__idx_SCD ( Source_System_Code ) 
INDEX B0381_ACCT_OBT_MAP__idx_OPID ( Operational_Acc_Obtained_Id );

输出：

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CREATE TABLE DP_TEDW.B0381_ACCOUNT_OBTAINED_MAP 
  ( Ranked_Id INTEGER NOT NULL
  , Source_System_Code SMALLINT NOT NULL
  , Operational_Acc_Obtained_Id VARCHAR( 100 )
  , Mapped_Id INTEGER NOT NULL
  ) 
DISTRIBUTE BY HASH ( Ranked_Id );

CREATE INDEX B0381_ACCT_OBT_MAP__idx_SCD ON DP_TEDW.B0381_ACCOUNT_OBTAINED_MAP ( Source_System_Code );
CREATE INDEX B0381_ACCT_OBT_MAP__idx_OPID ON DP_TEDW.B0381_ACCOUNT_OBTAINED_MAP ( Operational_Acc_Obtained_Id );

由于索引列列表（organic_name）不是DISTRIBUTE BY列列表（serial_no、organic_name）的超集，因此索引中删除了UNIQUE。

输入：CREATE TABLE，使用主键和非唯一主索引（未添加DISTRIBUTE BY HASH）

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CREATE TABLE employee
 (
   EMP_NO INTEGER
 , DEPT_NO INTEGER
 , FIRST_NAME VARCHAR(20)
 , LAST_NAME CHAR(20)
 , SALARY DECIMAL(10,2)
 , ADDRESS VARCHAR(100)
 , CONSTRAINT pk_emp PRIMARY KEY ( EMP_NO )
   ) PRIMARY INDEX ( DEPT_NO ) ;

输出：

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CREATE TABLE employee 
 (
   EMP_NO INTEGER
 , DEPT_NO INTEGER
 , FIRST_NAME VARCHAR(20)
 , LAST_NAME CHAR(20)
 , SALARY DECIMAL(10,2)
 , ADDRESS VARCHAR(100)
 , CONSTRAINT pk_emp PRIMARY KEY ( EMP_NO )       
  )
;

创建带索引分区表

如果配置参数tdMigrateRANGE_N为true。

输入：

CREATE SET TABLE SC.TAB , NO FALLBACK,
NO BEFORE JOURNAL,
NO AFTER JOURNAL,
CHECKSUM=DEFAULT,
DEFAULT MERGEBLOCKRATIO
(
ACCOUNT_NUM VARCHAR(255) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
,ACCOUNT_MODIFIER_NUM CHAR(18) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
,END_DT DATE FORMAT 'YYYY-MM-DD'
,UPD_TXF_BATCHTD INTEGER COMPRESS
)
PRIMARY INDEX XPKT0300_AGREEMENT (ACCOUNT_NUM,ACCOUNT_MODIFIER_NUM)
PARTITION BY RANGE_N(END_DT BETWEEN '2001-01-01' AND '2020-12-31' EACH INTERVAL '1' DAY, NO RANGE ,UNKNOWN)
INDEX (UPD_TXF_BATCHTD)
;

输出：

CREATE
     TABLE
          SC.TAB (
               ACCOUNT_NUM VARCHAR( 255 ) /* CHARACTER SET LATIN*/
                /* NOT CASESPECIFIC*/               NOT NULL
               ,ACCOUNT_MODIFIER_NUM CHAR( 18 ) /* CHARACTER SET LATIN*/               /* NOT CASESPECIFIC*/               NOT NULL
               ,END_DT DATE
               ,UPD_TXF_BATCHTD INTEGER /* COMPRESS */
          ) DISTRIBUTE BY HASH (
               ACCOUNT_NUM
               ,ACCOUNT_MODIFIER_NUM
          ) PARTITION BY RANGE (END_DT) (
               PARTITION TAB_1 start ('2001-01-01')
          END ('2020-12-31') EVERY (
               INTERVAL '1' DAY )
          ) ;
CREATE INDEX ON SC.TAB (UPD_TXF_BATCHTD) LOCAL;
父主题： 表迁移

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