mysql中的collate关键字是什么意思?

Question

CREATE TABLE `tb_order` (
  `order_id` varchar(50) COLLATE utf8_bin DEFAULT NULL COMMENT '订单id',
  `payment` varchar(50) COLLATE utf8_bin DEFAULT NULL COMMENT '实付金额。精确到2位小数;单位:元。如:200.07，表示:200元7分',
  `payment_type` int(2) DEFAULT NULL COMMENT '支付类型，1、在线支付，2、货到付款',
  `post_fee` varchar(50) COLLATE utf8_bin DEFAULT NULL COMMENT '邮费。精确到2位小数;单位:元。如:200.07，表示:200元7分',
  `status` int(10) DEFAULT NULL COMMENT '状态：1、未付款，2、已付款，3、未发货，4、已发货，5、交易成功，6、交易关闭',
  `create_time` datetime DEFAULT NULL COMMENT '订单创建时间',
  `update_time` datetime DEFAULT NULL COMMENT '订单更新时间',
  `payment_time` datetime DEFAULT NULL COMMENT '付款时间',
  `consign_time` datetime DEFAULT NULL COMMENT '发货时间',
  `end_time` datetime DEFAULT NULL COMMENT '交易完成时间',
  `close_time` datetime DEFAULT NULL COMMENT '交易关闭时间',
  `shipping_name` varchar(20) COLLATE utf8_bin DEFAULT NULL COMMENT '物流名称',
  `shipping_code` varchar(20) COLLATE utf8_bin DEFAULT NULL COMMENT '物流单号',
  `user_id` bigint(20) DEFAULT NULL COMMENT '用户id',
  `buyer_message` varchar(100) COLLATE utf8_bin DEFAULT NULL COMMENT '买家留言',
  `buyer_nick` varchar(50) COLLATE utf8_bin DEFAULT NULL COMMENT '买家昵称',
  `buyer_rate` int(2) DEFAULT NULL COMMENT '买家是否已经评价',
  UNIQUE KEY `order_id` (`order_id`) USING BTREE,
  KEY `create_time` (`create_time`),
  KEY `buyer_nick` (`buyer_nick`),
  KEY `status` (`status`),
  KEY `payment_type` (`payment_type`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

collate utf8_bin 是什么意思?

Answer 1

Specify how to sort the data set

Answer 2

Sort by binary encoding comparison. collate is the collation rule for the data table.

Answer 3

Proofreading sets are mainly used to compare and sort character sets. You can view all proofreading sets through show collation

In addition, you can refer to here, the official document is very detailed

http://dev.mysql.com/doc/refm...

http://dev.mysql.com/doc/refm...