Unless specified otherwise, uses the default column name col for elements of the array or key and value for the elements of the map select explode(array(10, 20)) from input array如果需要分割,需要和split嵌套使用 SELECT explode(split('1,2,3',',')) from input SELECT explode(map('A',...
请将"table_name"、"column1"和"column2"替换为你实际的表名和列名,"value1"和"value2"替换为实际的数据值。 如果设置成功,执行插入操作时将不会触发唯一约束的检查,即使插入了重复的数据。 4. 恢复原来的设置 在完成需要禁用唯一约束的操作后,你应该将"unique_checks"参数恢复到原来的设置,以确保数据库的一致...
SQLBindParameter 函式 SQLBrowseConnect 函式 SQLBulkOperations 函式 SQLCancel 函式 SQLCancelHandle 函式 SQLCloseCursor 函式 SQLColAttribute 函式 SQLColAttributes 函式 SQLColumnPrivileges 函式 SQLColumns 函式 SQLCompleteAsync 函式 SQLConnect 函式 SQLCopyDesc 函式 SQLDataSources 函式 SQLDescribeCol 函式...
SQL CREATETABLEdbo.t ( aINTPRIMARYKEY, b1INT); GOCREATEVIEWdbo.vASSELECTb1ASb2FROMdbo.t; GO EXEC sp_describe_first_result_set N'SELECTb2ASb3FROMdbo.v', NULL, 0; 以下为部分结果集。 is_hiddencolumn_ordinalnamesource_schemasource_tablesource_columnis_part_of_unique_key ...
ResultSetDatabaseMetaData.getColumns(Stringcatalog,StringschemaPattern,StringtableNamePattern,StringcolumnNamePattern) 获取可在指定类别中使用的表列的描述。 ResultSetDatabaseMetaData.getCrossReference(StringparentCatalog,StringparentSchema,StringparentTable,StringforeignCatalog,StringforeignSchema,StringforeignTable) ...
<name>hive.resultset.use.unique.column.names</name> <value>false</value> </property> <!-- 每个节点可以创建的最大分区数 默认值:100 --> <property> <name>hive.exec.max.dynamic.partitions.pernode</name> <value>100</value> </property> ...
Specifies that positioned updates or deletes made through the cursor don't succeed if the row was updated since being read into the cursor. SQL Server doesn't lock rows as they're read into the cursor. Instead, it uses comparisons of timestamp column values, or a checksum value, if the...
Binary string values are copied as is for bytes in the range0x20to0x7E, and using\xhexadecimal encoding for bytes outside that range. For example, if a duplicate-key error occurs for an attempt to insert0x41CF9Finto aVARBINARYunique column, the resulting error message uses UTF-8 with some...
is_identity_columnbit如果列是标识列,则返回 1;否则,返回 0。 如果无法确定列是否为标识列,则返回 NULL。 is_part_of_unique_keybit如果列是唯一索引的一部分(包括唯一约束和主约束),则返回 1;否则,返回 0。 如果无法确定列是否为唯一索引的一部分,则返回 NULL。 仅在请求...
The names of server-level firewall settings must be unique. If the name of the setting provided for the stored procedure already exists in the firewall settings table, the starting and ending IP addresses are updated. Otherwise, a new server-level firewall setting is created....