我使用的是:ALTER TABLE tablename ALTER COLUMN columnname DROP NOT NULL;,但它在HSQL中不起作用。 浏览0提问于2016-03-24得票数 8 2回答 SqlAlchemy:如何实现DROP TABLE ...层叠? 、、 我需要删除具有外键约束并需要DROP TABLE ... CASCADE的PostgreSQL数据库中的表。我可以执行原始SQL:engine.execute("...
ALTERTABLEtable_nameDROPCOLUMNcolumn_name [ CASCADE|RESTRICT ]; table_name:要修改的表的名称。 column_name:要删除的列的名称。 CASCADE:删除列时,同时删除所有依赖于该列的对象(如视图、索引)。 RESTRICT:如果列被其他对象(如视图、索引)引用,则阻止删除操作。 2. 实际操作步骤 2.1 确认现有列 在删除列之前...
SQL92 对 ALTER TABLE 声明了一些附加的 PostgreSQL 目前还不直接支持的功能: ALTER TABLE table DROP [ COLUMN ] column { RESTRICT | CASCADE } 从一个表中删除一个列. 目前,要删除一个现存的列,表必须重新创建和重新装载: CREATE TABLE temp AS SELECT did, city FROM distributors; DROP TABLE distributors...
在PostgreSQL 中,删除列使用ALTER TABLE语句,其基本语法如下: ALTERTABLEtable_nameDROPCOLUMNcolumn_name[CASCADE|RESTRICT]; table_name:要修改的表的名称。 column_name:要删除的列的名称。 CASCADE:删除列时,同时删除所有依赖于该列的对象(如视图、索引)。 RESTRICT:如果列被其他对象(如视图、索引)引用,则阻止删...
Example Postgres Log Output: ERROR: cannot drop table x because other objects depend on it DETAIL: view a depends on table x HINT: Use DROP ... CASCADE to drop the dependent objects too. STATEMENT: DROP TABLE x Explanation: A request was sent to drop a specific database object (e.g....
postgres=# drop table customer;ERROR: cannotdroptablecustomer because other objects dependonit DETAIL:constraintsales_customer_id_fkeyontablesales dependsontablecustomer HINT:UseDROP...CASCADEtodropthe dependent objects too.postgres=# Wie wir besprochen haben, hängt derSalesvon derCustomer-Tabelle ...
Advanced Server will perform one of the following actions when dropping the orders table, depending on the drop behavior that you specify: If you specify DROP TABLE orders RESTRICT, Advanced Server will report an error. If you specify DROP TABLE orders CASCADE, Advanced Server will drop the orde...
do $$declarer record;beginforrin(selecttablenamefrompg_tableswhereschemaname='my-schema-name')loopexecute'drop table if exists'||quote_ident(r.tablename)||'cascade';endloop;end$$; This query works by listing out all the tables in the given schema and then executing adrop tablefor each (...
:param table_name: Name of the database table. :type table_name: str :return: Returns True if the operation succeeded. otherwise False. :rtype: bool """ del_com = u'DROP TABLE IF EXISTS {0} CASCADE;'.format(table_name) t = text(del_com) try: _execute(t) return True #Error ...
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