ALTER TABLE product ADD CONSTRAINT FK_cno FOREIGN KEY(cno) REFERENCES category(cid 从表); sql语句的执行顺序是:from-->WHERE-->GROUP BY -->HAVING --- >ORDER BY --> SELECT; sql语句的编写顺序是:select -> FROM -> WHERE -> GROUP BY -> HAVING -> ORDER BY; 转换代码:convert(字段名 usi...
1. 新建表时添加外键 [CONSTRAINT] [外键约束名称] FOREIGN KEY(外键字段名) REFERENCES 主表名(主键字 段名) 2. 已有表添加外键 ALTER TABLE 从表 ADD [CONSTRAINT] [外键约束名称] FOREIGN KEY (外键字段名) REFERENCES 主表(主键字段名); */ -- 创建主表 create table department( id INT PRIMARY KEY...
addCommentOnTable() Builds a SQL command for adding comment to table. yii\db\sqlite\QueryBuilder addDefaultValue() Creates a SQL command for adding a default value constraint to an existing table. yii\db\sqlite\QueryBuilder addForeignKey() Builds a SQL statement for adding a foreign key constr...
String Post_Code = "CREATE TABLE IF NOT EXISTS PostCode(" + "PostCode_ID integer PRIMARY KEY, " + "Code string NOT NULL, " + "City_ID integer," + "FOREIGN KEY (City_ID)" + "REFERENCES City (City_ID)" + "ON UPDATE CASCADE " + "ON DELETE SET NULL, " + "County_ID integer,...
例子: alter table kk add column online int; 2.针对数据,在已有表的基础上 增 原型:insert into 表名 values(每一列的值); 例子:insert into kk values("xiaohua",4,1,); insert into kk values("GGB",5,0,); 查(表中数据) (1)查看所有 ...
表结构修改:仅支持renametable,addcolumn,dropcolumn,renamecolumn Select查询:仅持leftoutjoin View视图:不可修改 访问权限:仅支持操作系统级文件访问权限,不支持grant/revoke权限管理。 4. SQLite有两种使用方式: 控制台模式:CLI(命令行接口/命令行程序)模式 ...
You can create multiple VDatabaseVersion objects if you need to add new table or add new columns to a existing table. Add all versions to the given ArrayList "allVersions". Create VViewCreation objects, define your view. Put All VViewCreation objects into the given Map "viewCreationMap"....
sqlite> .open exp8.db sqlite> create table Studs( ...> id int not null primary key, ...> name varchar(20) not null ...> ); sqlite> select *from Studs ...> ; sqlite> create table Teachers( ...> id int not null primary key, ...> name varchar(20) not null ...> ); ...
ALTERTABLEtable_name RENAMETOtable_name2; 添加列 ALTERTABLEtable_nameADDCOLUMNAgeINT; 可以使用 “.schema”查看字段, “.tables” 查看表。 INSERT INSERTINTOTablename(colname1, colname2, ….)VALUES(valu1, value2, ….);INSERTINTOTablenameVALUES(value1, value2, ….); # 忽略列名INSERTINTOTable...
* Builds a SQL statement for adding a foreign key constraint to an existing table. 252 * Because SQLite does not support adding foreign key to an existing table, calling this method will throw an exception. 253 * @param string $name the name of the foreign key constraint. 254 * @param ...