All rows in Oracle have a rowid. This is a physical locator. That is, it states where on disk Oracle stores the row. This unique to each row. So you can use this value to identify and remove copies. To do this, replace min() with min(rowid) in the uncorrelated delete: Copy code ...
"rows": 3100, "cost": 719.1 } 分析结果:全表扫描访问的rows记录为3100,代价cost计算为719.1。 索引扫描的代价如下。 "range_scan_alternatives": [ { "index": "idx_gender", "ranges": [ "1 <= gender <= 1" ], "index_dives_for_eq_ranges": true, "rowid_ordered": true, "using_mrr": ...
Similar to traditional SQL statements, the DELETE and UPDATE statements in MaxCompute can be used to delete or update the data of specific rows in tables. Each time you execute the DELETE or UPDATE statement, a delta file is automatically generated to store information about the delete or upda...
【数据恢复】利用构造ROWID实现无备份情况下绕过ORA-1578、ORA-8103、ORA-1410等逻辑/物理坏块问题 【数据恢复】ORA-600[kccpb_sanity_check_2]一例 Oracle rman中set newname可能很慢 如何清除Oracle控制文件中的无用记录,例如v$archived_log中的deleted归档日志记录 如何找回被create or replace覆盖的PL/SQL对象 Ar...
Champ DTS_W_DUPLICATECUSTOMEVENT Champ DTS_W_DUPLICATEMAPPINGKEY Champ DTS_W_EMPTYDATAFLOW Champ DTS_W_EMPTYPATH Champ DTS_W_ENDOFFILEREACHWHILEREADINGHEADERROWS Champ DTS_W_ERRMSGTASK_ERRORMESSAGEALREADYEXISTS Champ DTS_W_EXECPROCTASK_FILENOTINPATH Champ DTS_W_EXPIRED_DEBUGONLY Champ DTS_W_EXPREV...
PL/SQL - Delete duplicate records without using sub query? Delete duplicate records without using sub query? Is That possible. 8 Answers are available for this question.