2. Adding a column to a SQLite table ALTER TABLE table_name ADD COLUMN column_name datatype; 3. Adding a NOT NULL constraint to a SQLite table column ALTER TABLE table_name ADD COLUMN column_name datatype NOT NULL DEFAULT default_value; 4. Adding a CHECK constraint to a SQLite table...
ALTER TABLE test1 ADD COLUMN foo; Or you can specify a type, if you prefer: ALTER TABLE test1 ADD COLUMN bar TEXT; You can even go crazy, and specify a type and a default value with the SQLite ALTER TABLE syntax: ALTER TABLE test1 ADD COLUMN baz TEXT NOT NULL DEFAULT 'baz'; ...
ALTER TABLE Albums RENAME TO Albums1;And check it with a .tables command:sqlite> .tables Albums1 Artists Now, any further operations will need to use the new name of the table. So we can select data like this:SELECT AlbumName, Year FROM Artists AS a INNER JOIN Albums1 AS r ON a....
When a new table is created, it must be in a database and the database name may be either "main", "temp", or the name of an attached database. If the keyword "TEMP" or "TEMPORARY" used between the "CREATE" and "TABLE" then the new table is created in the temp database. Both...
FROM table1 [, table2 ] [WHERE condition] 这里给定的条件根据需要可以是任何表达式。 实例 现在,让我们使用 SELECT 语句及 UNION ALL 子句来连接两个表,如下所示: sqlite> SELECT EMP_ID, NAME, DEPT FROM COMPANY INNER JOIN DEPARTMENT ON COMPANY.ID = DEPARTMENT.EMP_ID ...
一,修改表 PostgreSQL 提供了一族命令用于修改现有表。 可以实现:增加字段, 删除字段, 增加约束, 删除约束, 修改默认值, 重命名字段, 重命名表。 这些操作可以用:ALTERTABLE命令执行的。1,增加字段 要增加一个字段,使用这条命令:ALTERTABLE products ADD COLUM ...
下面就针对alter修改命令的使用做一梳理: 1)删除列 alter table 表名 DROP 列名; //或者 alter table 表名 drop column 列名...(慎用) 11)修改字段属性 alter table 表名 modify column 字段名 类型 alte...
Alter column set default不支持的功能 是修改列的数据类型和长度。 在使用ALTER TABLE语句修改列时,可以使用ALTER COLUMN子句来修改列的默认值,但是无法通过ALTER COLUMN来修改列的数据类型和长度。 如果需要修改列的数据类型或长度,需要使用其他方式,例如创建一个新的列,将数据从旧列复制到新列,然后删除旧列。 对于...
name = 'AlterOrderColumnToTheTaskStatusEntityTable1703571105557'; /** * Up Migration * * @param queryRunner */ public async up(queryRunner: QueryRunner): Promise<any> { if (['sqlite', 'better-sqlite3'].includes(queryRunner.connection.options.type)) { await this.sqliteUpQueryRunner(queryRunner)...
table, but the values are all zero. The UPDATE part didn't get committed, but the ALTER TABLE did. This is a sqlite3 database, by the way... is there some limitation in SQLite that doesn't roll back an ALTER TABLE, or am I doing something ...