1.Alter table : 1.添加和修改列 2.添加和删除约束 3.enable,disable约束 2.drop table命令移除表中所有行和表结构 3.rename,truncate,comment 4.当执行以上DDL语句时,事务自动提交 三、详细说明 1.增加列: 语法: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 alter table
alter table husband add sage number constraint husband_sage_check check(sage<=100); 1. 2.删除列: 语法:alter table tableName drop column column_name; 例如: alter table test drop column name; 1. 3.修改列属性:(数据类型和约束) 语法: ALTER TABLE table MODIFY (column datatype [DEFAULT expr]...
(200); 14 begin 15 v_sql := 'select COLUMN_NAME from user_tab_columns where table_name = ''' || upper(tableName) || ''' order by COLUMN_ID asc'; 16 open v_cursor for v_sql; 17 loop 18 fetch v_cursor into v_temp; 19 exit when v_cursor%notfound; 20 if type = 'select...
D.TABLE_NAME ||'.' || D.COLUMN_NAME PK_COLUMN, A.CONSTRAINT_TYPE, B.CONSTRAINT_NAME FK_NAME, B.TABLE_NAME ||'.' || B.COLUMN_NAME FK_COLUMN FROMDBA_CONSTRAINTS A JOINDBA_CONS_COLUMNS B ONA.CONSTRAINT_NAME = B.CONSTRAINT_NAME ANDA.OWNER = B.OWNER JOINDBA_CONSTRAINTS C ONA.R_CO...
{ "CatalogId": "string", "ColumnName": "string", "DatabaseName": "string", "TableName": "string" } Request Parameters For information about the parameters that are common to all actions, see Common Parameters. The request accepts the following data in JSON format. CatalogId The ID ...
Oracle中的Truncate和Delete语句 Oracle中的Truncate和Delete语句 首先讲一下,truncate命令: 语法:TRUNCATE TABLE table; 表格里的数据被清空,存储空间被释放。 运行后会自动提交,包括之前其它未提交的会话,因而一旦清空无法回退。 只有表格的创建者或者其他拥有删除任意表格权限的用户(如D 数据 删除表 触发器 删除...
B.TABLE_NAME ||'.' || B.COLUMN_NAME FK_COLUMN FROMDBA_CONSTRAINTS A JOINDBA_CONS_COLUMNS B ONA.CONSTRAINT_NAME = B.CONSTRAINT_NAME ANDA.OWNER = B.OWNER JOINDBA_CONSTRAINTS C ONA.R_CONSTRAINT_NAME = C.CONSTRAINT_NAME ANDA.R_OWNER = C.OWNER ...
ALTER TABLE tbl_name ADD COLUMN col_name col_type, ALGORITHM=INPLACE, LOCK=NONE; ALGORITHM选项 INPLACE:替换:直接在原表上面执行DDL的操作。 COPY:复制:使用一种临时表的方式,克隆出一个临时表,在临时表上执行DDL,然后再把数据导入到临时表中,在重命名等。这期间需要多出一倍的磁盘空间来支撑这样的 操作...
sellerid not in(select sales.sellerid from sales); The following two queries both delete one row from the CATEGORY table, based on a join to the EVENT table and an additional restriction on the CATID column: delete from category using event where event.catid=category.catid and category.catid...
CreateTable CreateTableOptimizer CreateTrigger CreateUsageProfile CreateUserDefinedFunction CreateWorkflow DeleteBlueprint DeleteCatalog DeleteClassifier DeleteColumnStatisticsForPartition DeleteColumnStatisticsForTable DeleteColumnStatisticsTaskSettings DeleteConnection DeleteCrawler DeleteCustomEntityType DeleteDatabase Delete...