文档首页> 数据仓库服务 GaussDB(DWS)> 工具指南> DSC> SQL语法迁移参考> Teradata语法迁移> 数据操作语句（DML）> DELETE
更新时间：2024-04-18 GMT+08:00
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DELETE

DELETE（缩写关键字为DEL）是ANSI标准的SQL语法操作符，用于从表中删除记录。DSC支持Teradata的DELETE语句及其缩写关键字DEL。不包含WHERE子句的DELETE语句在DWS中被迁移为TRUNCATE。通过deleteToTruncate参数可以配置是否启用/禁用此行为。

输入：DELETE

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DEL FROM tab1
 WHERE a =10;

输出

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DELETE FROM tab1
 WHERE a =10;

输入：DELETE，不使用WHERE（如果deletetoTruncate=TRUE，则迁移为TRUNCATE）

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DELETE FROM ${schemaname} . "tablename" ALL;

输出

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TRUNCATE
     TABLE
          ${schemaname} . "tablename";

以下输入示例中，DELETE和FROM子句引用相同表，按是否使用WHERE子句区分：

输入

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DELETE DP_TMP.M_P_TX_SCV_REMAINING_PARTY 
FROM DP_TMP.M_P_TX_SCV_REMAINING_PARTY ALL ;
---
DELETE DP_VMCTLFW.CTLFW_Process_Id 
FROM DP_VMCTLFW.CTLFW_Process_Id 
WHERE (Process_Name =  :_spVV2 ) 
AND  (Process_Id  NOT IN (SELECT MAX(Process_Id )(NAMED Process_Id ) 
                                      FROM DP_VMCTLFW.CTLFW_Process_Id 
                                     WHERE Process_Name =  :_spVV2 )
      );
---
DELETE CPID 
FROM DP_VMCTLFW.CTLFW_Process_Id AS CPID
WHERE (Process_Name =  :_spVV2 ) 
AND  (Process_Id  NOT IN (SELECT MAX(Process_Id )(NAMED Process_Id ) 
                                      FROM DP_VMCTLFW.CTLFW_Process_Id 
                                     WHERE Process_Name =  :_spVV2 )
      );

输出

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DELETE FROM DP_TMP.M_P_TX_SCV_REMAINING_PARTY;
---
DELETE FROM DP_VMCTLFW.CTLFW_Process_Id 
WHERE (Process_Name =  :_spVV2 ) 
AND  (Process_Id  NOT IN (SELECT MAX(Process_Id )(NAMED Process_Id ) 
                                      FROM DP_VMCTLFW.CTLFW_Process_Id 
                                     WHERE Process_Name =  :_spVV2 )
      );
---
DELETE FROM DP_VMCTLFW.CTLFW_Process_Id AS CPID
WHERE (Process_Name =  :_spVV2 ) 
AND  (Process_Id  NOT IN (SELECT MAX(Process_Id )(NAMED Process_Id ) 
                                      FROM DP_VMCTLFW.CTLFW_Process_Id 
                                     WHERE Process_Name =  :_spVV2 )
      );

DELETE table_alias FROM table

输入

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SQL_Detail10124.sql
delete a
  from ${BRTL_DCOR}.BRTL_CS_POT_CUST_UMPAY_INF_S as a
 where a.DW_Snsh_Dt = cast('${v_Trx_Dt}' as date format 'yyyy-mm-dd') 
 and a.DW_Job_Seq = 1 ;
was migrated as below:
      DELETE FROM
           BRTL_DCOR.BRTL_CS_POT_CUST_UMPAY_INF_S AS a
                USING
      WHERE a.DW_Snsh_Dt = CAST( lv_mig_v_Trx_Dt AS DATE )
           AND a.DW_Job_Seq = 1 ;
SQL_Detail10449.sql
delete a
  from ${BRTL_DCOR}.BRTL_EM_YISHITONG_USR_INF as a
 where a.DW_Job_Seq = 1 ;
was migrated as below:
      DELETE FROM
           BRTL_DCOR.BRTL_EM_YISHITONG_USR_INF AS a
                USING
      WHERE a.DW_Job_Seq = 1 ;
SQL_Detail5742.sql
delete a
  from ${BRTL_DCOR}.BRTL_PD_FP_NAV_ADT_INF as a;
was migrated as 
      DELETE a
 FROM
      BRTL_DCOR.BRTL_PD_FP_NAV_ADT_INF AS a ;

输出

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SQL_Detail10124.sql
delete from ${BRTL_DCOR}.BRTL_CS_POT_CUST_UMPAY_INF_S as a
 where a.DW_Snsh_Dt = cast('${v_Trx_Dt}' as date format 'yyyy-mm-dd') 
 and a.DW_Job_Seq = 1 ;
SQL_Detail10449.sql
delete from ${BRTL_DCOR}.BRTL_EM_YISHITONG_USR_INF as a
 where a.DW_Job_Seq = 1 ;
SQL_Detail5742.sql
delete from ${BRTL_DCOR}.BRTL_PD_FP_NAV_ADT_INF as a;
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