mysql：第七章 Alter语句修改表字段及属性

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//修改字段脚本（COMMENT关键字：用于给字段添加注释）

ALTER TABLE T_KM_KEY_WORD_STATIS CHANGE KW_ID KYWDS_ID BIGINT NOT NULL COMMENT '关键词ID';
ALTER TABLE T_KM_KEY_WORD_STATIS CHANGE KW_VAL KYWDS_NM VARCHAR (255) NOT NULL COMMENT '关键词名称';
ALTER TABLE T_KM_KEY_WORD_STATIS CHANGE TOTAL_CLCK_QUT TOTAL_SERCH_QUT BIGINT COMMENT '总搜索量';
ALTER TABLE T_KM_KEY_WORD_STATIS CHANGE DAILY_CLCK_QUT DAILY_SERCH_QUT BIGINT COMMENT '日搜索量';
ALTER TABLE T_KM_KEY_WORD_STATIS CHANGE WEEK_CLCK_QUT WEEK_SERCH_QUT BIGINT COMMENT '周搜索量';
ALTER TABLE T_KM_KEY_WORD_STATIS CHANGE MON_CLCK_QUT MON_SERCH_QUT BIGINT COMMENT '月搜索量';

//标准化脚本
CREATE TABLE `T_KM_KEY_WORD_STATIS` (
    `KYWDS_ID` BIGINT NOT NULL COMMENT '关键词ID',
    `KYWDS_NM` VARCHAR (255) NOT NULL COMMENT '关键词名称',
    `CHNL_CODE` VARCHAR (40) COMMENT '渠道编码',
    `REGN_ID` VARCHAR (40) COMMENT '地区ID',
    `TOTAL_SERCH_QUT` BIGINT COMMENT '总搜索量',
    `DAILY_SERCH_QUT` BIGINT COMMENT '日搜索量',
    `WEEK_SERCH_QUT` BIGINT COMMENT '周搜索量',
    `MON_SERCH_QUT` BIGINT COMMENT '月搜索量',
    `CRT_TIME` DATETIME COMMENT '创建时间',
    `INVLD_TIME` DATETIME COMMENT '失效时间',
    `OP_PRSN_ID` VARCHAR (40) COMMENT '操作人员ID',
    `TENANT_ID` VARCHAR (40) COMMENT '租户ID',
    `CMOS_MODIFY_TIME` DATETIME (3) NOT NULL DEFAULT CURRENT_TIMESTAMP (3) ON UPDATE CURRENT_TIMESTAMP (3) COMMENT '同步时间标识',
    PRIMARY KEY (`KYWDS_ID`),
  KEY IDX_CMOS_MODIFY_TIME (CMOS_MODIFY_TIME)
) COMMENT '关键词维护表';