how to drop a column in sqlite 在sqlite中可以使用ALTER TABLE语法对表结构进行修改,从官方的文档说明中,语法如下图: 从图中可以看出,ALTER TABLE仅仅支持表名重命名,添加字段,却没有删除字段的方法。那么该如何实现,当然了首先search 一下,群众们给出的一个解决方案就是将数据备份到一张临时表,删除原始表,然...
SQLite使用dropcolumn删除表字段如下sql语句会复制一个和record表一样表结构的temp表出来但是我们想要的是去除某一个字段例如去除record表中的name字段就不要复制它就好了所以sql语句如下 SQLite 使用 dropcolumn 删除表字段 由于项目需求变更,我需要在 sqlite 数据库的表中删除一个字段, 通用的 sql 操作语句如下: [...
SQLite无法使用drop column删除表字段解决办法 由于项目需求变更,我需要在sqlite数据库的表中删除一个字段,通用的sql操作语句如下: alter table record drop column name; 结果数据库提示如下错误: 搜索得知,原来SQLite目前还不支持drop column,所以必须想出另外一种方法来进行表字段的删除,读者要是说:“直接删掉这个表...
SQLite无法使用drop column删除表字段解决办法 由于项目需求变更,我需要在sqlite数据库的表中删除一个字段,通用的sql操作语句如下: altertablerecorddropcolumnname; 1. 结果数据库提示如下错误: 搜索得知,原来SQLite目前还不支持drop column,所以必须想出另外一种方法来进行表字段的删除,读者要是说:“直接删掉这个表,然...
lijinma 吹牛大王 @ 币圈金马奖
public function up(): void { $isSqlite = \Illuminate\Support\Facades\DB::getDriverName() === 'sqlite'; Schema::table('project_assignments', function (Blueprint $table) use ($isSqlite) { if (! $isSqlite) { $table->dropForeign(['user_id']); } $table->dropColumn('user_id'); ...
Example 1: Drop the Column from the Table Run the following ALTER TABLE statement to remove the “brand” field from the “products” table: ALTERTABLEproductsDROPCOLUMNbrand; Run the following SQLite command to check whether the “brand” field is deleted or not from the “products” table:...
Hi, SQLite doesn't support modifying constraints/columns to an existing table so DBeaver allows to set them only during table creation so I suggest to support modifying constraints/columns by using this trick (I hate to write scripts whe...
The ALTER TABLE command can only be used in SQLite to allow the user only to rename a table or to add a new column to an existing table. It is not possible to rename a column or remove a column, or add or remove constraints from a table....
FromResult and Error Codesin the SQLite docs: The rowid of a table must be an integer. Attempt to set the rowid to anything other than an integer results in an SQLITE_MISMATCH error. You'll need to use aDropColumnwith anAddColumnoperation instead. ...