Append-only ledger tables allow only INSERT operations on your tables, which ensure that privileged users such as database administrators can't alter data through traditional Data Manipulation Language operations. Append-only ledger tables are ideal for systems that don't update or delete records, ...
For example, suppose you have the following two tables: November and December. NovemberDecember You can use the following custom SQL query to append the second table, December, to the first table, November: SELECT * FROM November UNION ALL SELECT * FROM December The result of the query looks...
If the history table doesn't exist, the system generates a new history table matching the schema of the current table in the same filegroup as the current table, creating a link between the two tables and enables the system to record the history of each record in the current table in the...
If the history table doesn't exist, the system generates a new history table matching the schema of the current table in the same filegroup as the current table, creating a link between the two tables and enables the system to record the history of each record in the current table in the...
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[sql] [错误]修复了在某些情况下,使用literal_execute=True时多次使用相同的绑定参数会由于迭代问题导致渲染错误值的问题。 参考资料:#10142 [sql] [错误]修复了对Column或其他ColumnElement的反序列化失败无法恢复正确的“比较器”对象的基本问题,该对象用于生成特定于类型对象的 SQL 表达式。 参考资料:#10213 ...
# engine, suppose it has two tables 'user' and 'address' set up engine = create_engine("sqlite:///mydatabase.db") # reflect the tables Base.prepare(engine, reflect=True) tables = Base.classes#<-load tables User = Base.classes.user ...
doing so would invalidate the incremental maintenance of the dependent tables. The restricted physical attribute modification may include: adding a column, altering a column; or altering one of the following values: data capture, value compression, append, compact, logged, activate not logged ...
A cycle involving two or more tables must not cause a table to be delete-connected to itself. Thus, if the relationship would form a cycle: The referential constraint cannot be defined if each of the existing relationships that would be part of the cycle have a delete rule of CASCADE. CAS...
Statistics created on internal tables. Statistics created with spatial indexes or XML indexes. When to create statistics The Query Optimizer already creates statistics in the following ways: The Query Optimizer creates statistics for indexes on tables or views when the index is created. These statistic...