1、T-SQL语句添加约束(表中没有数据时): 语法:alter table <表名> add constraint <约束名> <约束类型> <具体的约束说明 > 约束名的取名规则推荐采用:约束类型_约束列 主键(Primary Key)约束:如:PK_UserId 唯一(Unique Key) 约束:如:UQ_UserCardId 默认(Default Key)约束:如 DK_ 检查(Check Key) 约...
alter table 表名 add constraint 约束名 check (字段 between 1 and 100 ) ---添加外键约束(主表stuInfo和从表stuMarks建立关系,关联字段为stuNo) alter table 从表 add constraint 约束名 foreign key(关联字段) references 主表(关联字段) --sql server中删除约束的语句是: alter table 表名 drop constrai...
使用唯一索引，试试：create index idx_xxx on AccountVoucher(AccountId,convert(varchar(6),x.VoucherDate,112),VoucherNo)
Like the primary key constraint, the unique constraint automatically creates a unique index with the same name as the constraint. By default, the index will be nonclustered. SQL uses that index to enforce the uniqueness of the column or combination of columns. 和主键约束一样,唯一性约束自动创建...
java代码报错：java.sql.BatchUpdateException: ORA-00001: 违反唯一约束条件 (TTT.table)at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:629)at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:9447)at oracle.jdbc.driver.OracleStatement...
Save Add to Collections Add to Plan Share via Facebook x.com LinkedIn Email Print UniqueConstraintDefinition.Accept(TSqlFragmentVisitor) Method Reference Feedback Definition Namespace: Microsoft.SqlServer.TransactSql.ScriptDom Assembly: Microsoft.SqlServer.TransactSql.ScriptDom.dll Package...
'宣告PublicOverridableSubExplicitVisit ( _ nodeAsUniqueConstraint _ ) 參數 node 型別:Microsoft.Data.Schema.ScriptDom.Sql.UniqueConstraint 指定的片段型別。 .NET Framework 安全性 完全信任立即呼叫者。這個成員無法供部分信任的程式碼使用。如需詳細資訊,請參閱從部分受信任程式碼使用程式庫。
SqlCheckConstraint SqlClrAssemblySpecifier SqlClrClassSpecifier SqlClrFunctionBodyDefinition SqlClrMethodSpecifier SqlClusterOption SqlCodeObject SqlCodeObjectContextVisitor<C> SqlCodeObjectContextVisitor<T,C> SqlCodeObjectRecursiveContextVisitor<C> SqlCodeObjectRecursiveContextVisitor<T,C> ...
TSqlFragmentVisitor TSqlParser TSqlParserToken TSqlScript TSqlStatement TSqlStatementSnippet TSqlTokenType TSqlTriggerEventGroupHelper TSqlTriggerEventTypeHelper UnaryExpression UnaryExpressionType UniqueConstraintDefinition UniqueConstraintDefinition Constructores Propiedades Métodos Aceptar AcceptChildre...
Without Feature T301, "Functional dependencies", in conforming SQL language, each column reference contained in a <query expression> in the <search condition> that references a column of T shall be one of the following: a) An unambiguous reference to a grouping column of T. b) Contained in...