table-level constraint中文什么意思

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Type , you can define column - level or table - level constraints
類型的列時(shí)，可以定義列級(jí)約束或表級(jí)約束。
For database table - level constraint
表級(jí)約束
Table - level constraint
表級(jí)約束
This includes all column - level and table - level constraints in create table , stored procedures , and triggers
這包括create table中所有列級(jí)約束和表級(jí)約束、存儲(chǔ)過程以及觸發(fā)器。
Because check constraints can reference only the columns on which the column - level or table - level constraint is defined , any cross - table constraints in this case , business rules must be defined as triggers
由于check約束只能引用定義了列級(jí)或表級(jí)約束的列，表間的任何約束（在本例中是業(yè)務(wù)規(guī)則）都必須定義為觸發(fā)器。

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