uniquekey constraint requires that every value in a column or set of columns beunique. No rows of a table may have duplicate values in a column (the uniquekey) or set of columns (the composite unique key) with a
uniquekey constraint requires that every value in a column or set of columns beunique. No rows of a table may have duplicate values in a column (the uniquekey) or set of columns (the composite unique key) with a unique key constraint. Note: Theterm key refers only to the columns define...
uniquekey constraint requires that every value in a column or set of columns beunique. No rows of a table may have duplicate values in a column (the uniquekey) or set of columns (the composite unique key) with a unique key constraint. Note: Theterm key refers only to the columns define...
SQL>insert into test_unique_index values(1,'a', null);1 row created. SQL>insert into test_unique_index values(1,'a', null);insert into test_unique_index values(1, 'a', null)*ERROR at line 1:ORA-00001: unique constraint (BISAL.IDX_TEST...
must be distinct. An error occurs if you try to add a new row with a key value that matches an existing row. This constraint does not apply to NULL values except for the BDB storage engine. For other engines, a UNIQUE index allows multiple NULL values for columns that can contain NULL...
Encrypting and Decrypting Data Columns Managing Data Permissions Through Views Database Management Role-based Access Control (RBAC) Configuring Read-Only Permissions Excellent Practices for SQL Queries Data Skew Queries Real-Time Detection of Storage Skew During Data Import Quickly Locating the...
GS_INSTR_UNIQUE_SQL GS_NODE_STAT_RESET_TIME GS_OBS_LATENCY GS_QUERY_MONITOR GS_QUERY_RESOURCE_INFO GS_REL_IOSTAT GS_RESPOOL_RUNTIME_INFO GS_RESPOOL_RESOURCE_INFO GS_RESPOOL_MONITOR GS_ROW_TABLE_IO_STAT GS_SESSION_CPU_STATISTICS GS_SESSION_MEMORY_STATISTICS GS_SQL_COUNT...
/*常用语法*/CREATE[UNIQUE | BITMAP]INDEX[schema.]indexnameON[schema.]tablename(column,….);DROPINDEXindexname; 3. CONSTRAINT 约束 官方描述:Use a constraint to define an integrity constraint—a rule that restricts the values in a database. ...
constraint_name TEXT 约束的名称。 table_name TEXT 约束所属表的名称。 column_name TEXT 约束中引用的列的名称。 position SMALLINT 列在对象定义中的位置。 3.8.3.10 dba_ind_columns 描述了数据库中所有表和集群的所有索引的列。它的列与 ALL_IND_COLUMNS 中的列相同。 名称类型说明 index_owner name 索引...
java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (USR_JXZX_DSJKF_MODEL.SYS_C001362707) violated 主键不一致,须联系数据中心修改 经DataX智能分析,该任务最可能的错误原因是: com.alibaba.datax.common.exception.DataXException: Code:[Framework-14], Description:[DataX传输脏数据...