您可以使用foreach循环生成VALUES部分。首先，将plot_id列更改为varchar或text数据类型，并将所有值添加到...
ALTER TABLE students ADD COLUMN age INT, ADD COLUMN email VARCHAR(255); 这条语句会在students表中添加两列:age(整型)和email(最多255个字符的字符串型)。 在数据库管理工具或命令行中执行SQL语句: 你可以在MySQL的命令行客户端、图形化管理工具(如phpMyAdmin、MySQL Workbench等)中执行上述SQL语句。 验证列...
INSERT INTO customers(cust_id, cust_name, cust_address, cust_city, cust_state, cust_zip, cust_country, cust_contact, cust_email) VALUES(10001, 'Coyote Inc.', '200 Maple Lane', 'Detroit', 'MI', '44444', 'USA', 'Y Lee', 'ylee@coyote.com'); INSERT INTO customers(cust_id, cust...
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A multiple-column index can be considered a sorted array, the rows of which contain values that are created by concatenating the values of the indexed columns. 联合索引是多列按照次序一列一列比较大小,拿idx_book_id_hero_name这个联合索引来说,先比较book_id,book_id小的排在左边,book_id大的排在...
insert into temp values(null,'李琦');#失败 ERROR 1048 (23000): Column 'id' cannot be null 1. 2. 3. 4. 5. #演示一个表建立两个主键约束 create table temp( id int primary key, name varchar(20) primary key ); ERROR 1068 (42000): Multiple(多重的) primary key defined(定义) ...
The exception is for “mixed-mode inserts”, where the user provides explicit【[ɪkˈsplɪsɪt 明确的】 values for an AUTO_INCREMENT column for some, but not all,(部分AUTO_INCREMENT值明确了,部分没有明确) rows in a multiple-row “simple insert”. For such inserts, InnoDB allocates...
Next, will be the column names to be inserted along with their corresponding values. Again, this also is mandatory and cannot be omitted. Next, will be the values clause. In this clause, one has to provide the value for each and every column that we are inserting into the table. The ...
Enumeration values Possible values are shown, along with descriptions, in the following table: Table 2.8 Column object ArrayType data type values and descriptions NameDescription ArrayTypeFixed stored as a fixed number of bytes ArrayTypeShortVar stored as a variable number of bytes; uses 1 byte...
disable-keys TRUE 表示生产 insert 语句之前,生成:/*!40000 ALTER TABLE `tbl` DISABLE KEYS */; 可以加快insert速度; extended-insert TRUE 表示生产的insert是insert into `tbl` values(...),(...),数据行按照net-buffer-length分割合并成多个batch insertlock-tablesTRUE 表示在导出的过程中会锁定所有表; ...