delete from table_name where Stockid = 3 truncate table_name --- 删除表中所有行,仍保持表的完整性 drop table table_name --- 完全删除表 ***alter table*** --- 修改数据库表结构 alter table database.owner.table_name add column_name char(2) null ... sp_help table_name --- 显示表已...
SQL语句大全 –语 句功能 –数据操作 SELECT –从数据库表中检索数据行和列 INSERT –向数据库表添加新数据行 DELETE –从数据库表中删除数据行 UPDATE –更新数据库表中的数据 -数据定义 CREATE TABLE –创建一个数据库表 DROP TABLE –从数据库中删除表 ALTER TABLE –修改数据库表结构 CREATE VIEW –创建...
请使用 TRUNCATE TABLE 语句: TRUNCATE TABLE test; 1. 26.SQL ALTER TABLE 作用: ALTER TABLE 语句用于在已有的表中添加、删除或修改列。 例子: ALTER TABLE test ADD COLUMN d int(8); 1. 2. 在指定位置添加列 ALTER TABLE test ADD COLUMN e int(8) AFTER c; 1. 2. 27-28不表 29.SQL Date ...
SQL Server数据库基础 当创建了数据库之后,下一步就需要设计数据库对象。SQL Server能够创建多种数据库对象,如表、索引、视图、存储过程、游标、触发器等。本章将对其基础知识、相关的操作进行详细介绍。 本章主要内容: l表 l索引 l视图 l存储过程 l游标 l触发器 1表 本节我们介绍数据表的基础知识,以及一些基...
The NO_TRUNCATE option of BACKUP LOG is equivalent to specifying both COPY_ONLY and CONTINUE_AFTER_ERROR. Without the NO_TRUNCATE option, the database must be in the ONLINE state. If the database is in the SUSPENDED state, you might be able to create a backup by specifying NO_TRUNCATE....
8.TRUNCATE：用于清空表中的所有数据，但保留表结构。9.WHERE：用于过滤检索条件。10.ORDER BY：用于对...
If the length of character data (including the null-termination character) exceeds the length of the data buffer, SQLFetch truncates the data to the length of the data buffer less the length of a null-termination character. It then null-terminates the data. If the length of binary data ...
A 'filename' can contain only single-byte characters from 7-bit ASCII or EBCDIC character sets. Multibyte characters are not valid. A redo log file group can have one or more members (copies). Each 'filename' must be fully specified according to the conventions for your operating system....
('*'), ensure that the name tests in the pattern expression correctly use the wildcard. If used with a QName, there must be a colon before or after the wildcard character, otherwise it becomes a multiplication operator. The asterisk cannot be used as a multiplication operator in the ...
仅包含CREATE TABLE、DROP TABLE、TRUNCATE TABLE、ALTER TABLE、CALL、CREATE EXTENSION、CREATE FOREIGN TABLE、ALTER FOREIGN TABLE、IMPORT FOREIGN SCHEMA、DROP FOREIGN TABLE、CREATE SCHEMA、CREATE VIEW、DROP VIEW、GRANT、CREATE ROLE、ALTER ROLE、COMMENT这些DDL。