可以使用 SQL Server Management Studio 或 Transact-SQL 在表中创建检查约束,以指定 SQL Server 的一个或多个列中可接受的数据值。 要详细了解如何添加列约束,请参阅 ALTER TABLE column_constraint。 有关详细信息,请参阅 Unique 约束和 check 约束。 备注 若要查询现有的检查约束,请使用 sys.check_constraints...
在MySQL 8.0.16,CREATE TABLE添加了针对所有存储引擎的表和列的CHECK约束的核心特性。CREATE TABLE允许如下针对表或列的约束语法: [CONSTRAINT [symbol]] CHECK (expr) [[NOT] ENFORCED] 1. 可选的symbol指定了约束的名称,如果省略,MySQL会自动生成一个类似:${table_name}_check_${seq_num}的约束名称,约束名称...
Checking Whether the SQL Server Agent of the Source Database Is Enabled Checking Whether the Values of group_concat_max_len Are Consistent Checking Whether the Table Structures of the Source Database Are Consistent Checking Whether the Character Sets Are Compatible Whether There Are XA Transact...
Check the integrity of all the index pages and table data pages. Physical only Limits the check to the integrity of the physical structure of the page, record headers, and the allocation consistency of the database. Using this option may reduce run-time for DBCC CHECKDB on ...
POST https://management.azure.com/subscriptions/{subscriptionId}/providers/Microsoft.Sql/checkNameAvailability?api-version=2021-11-01 URI Parameters Expand table NameInRequiredTypeDescription subscriptionId path True string The subscription ID that identifies an Azure subscription. api-version query ...
The database should be configured following the documentation in Connecting JIRA applications to MySQL 5.6. Note that MySQL 5.6 is not supported in Jira 8.12 and later. How to verify table collations SELECT DISTINCT C.collation_name, T.table_name FROM information_schema.tables AS T, informa...
Check statement aborted. The database could not be checked as a database snapshot could not be created and the database or table could not be locked. See Books Online for details of when this behavior is expected and what workarounds exist. Also see previous ...
SQL Server Azure SQL 数据库 Azure SQL 托管实例 检查指定数据库的磁盘空间分配结构的一致性。 Transact-SQL 语法约定 语法 syntaxsql复制 DBCCCHECKALLOC[ (database_name|database_id|0[ ,NOINDEX| , {REPAIR_ALLOW_DATA_LOSS|REPAIR_FAST|REPAIR_REBUILD} ] ) [WITH{ [ALL_ERRORMSGS] [ ,NO_INFOMSGS] ...
SQL Server Azure SQL 数据库 Azure SQL 托管实例 检查当前数据库中指定表上的指定约束或所有约束的完整性。 Transact-SQL 语法约定 语法 syntaxsql DBCCCHECKCONSTRAINTS[ (table_name|table_id|constraint_name|constraint_id) ] [WITH[ {ALL_CONSTRAINTS|ALL_ERRORMSGS} ] [ , ] [NO_INFOMSGS] ] ...
SQL Server 2008 (10.x) to SQL Server 2014 (12.x) Expand table Configuration settingServer architectureDefault number of entries access check cache quota x86 1,024 x64 and IA-64 28,192,048 access check cache bucket count x86 256 x64 and IA-64 2,048 In rare circumstances, performance ...