留备 原数据idname1张三,李四,王二2zhangsan,lisi,wanger目标数据idname1张三1李四1王二2zhangsan2lisi2wanger select t.id, substring_index(substring_index(t.name,',',t1.help_topic_id+1),',',-1) name from z
CREATE SEQUENCE id_seq START WITH 5; ALTER TABLE guarantee_contract_open_status ALTER COLUMN id SET DEFAULT nextval('id_seq'::regclass); 转载于:https://my.oschina.net/u/4043279/blog/3002216
postgres删除重复数据 sql语句: delete from table where ctid not in (select min(ctid) from table group by tableColumn) 其中: table是数据表表名, tableColumn是判断数据是否重复的关键列,根据情况替换;ctid是postgres中的关键字,不可替换。可以将min(ctid)换成
select * from students select * from students2 –#创建学生表 CREATE TABLE students2 ( stu_num int NOT NULL, stu_name varchar(50), stu_gender varchar(10), stu_age int NOT NULL, PRIMARY KEY (stu_num) ) CRE
该表的该字段类型是map<string,string> 对应类的该属性的类型需要定义成String,不可定义成Map<String,String> !! 方法1: 建表语句定义map的分隔符: row format delimited fields terminated by '|' collection items terminated by ',' map keys term
1. Mybatis插入实体类字段为关键字解决方案 1.1. 前言 可能你插入字段为关键字时报如下错误,且字段名不适合改变 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 1.2
//通过节点对象层层找出每一行的车牌号码值进行比对 var listTable =$('.datagrid-btable')[1]; var tbodys = listTable.childNodes; var trs = tbodys[0].childNodes; for(var i=0,len=trs.length;i<len;i++){ var tds = trs[i
表结构如 CREATE TABLE IF NOT EXISTS public.user ( id PRIMARY KEY, name varchar(32) NOT NULL UNIQUE, ...... ); 修改语句 alter table public.user alter name set data type varchar(52); 由于受“UNIQUE”条件的约
当A表的X字段被修改时,修改B表中的Y字段 A表和B表的关联关系为:A.X=B.Y CREATE OR REPLACE TRIGGER 存储过程名称AFTER UPDATE OF X ON A--当A表的X字段被修改时FOR EACH ROWBEGINIF :OLD.X<>:NEW.X THENUPDATE B SET Y=:NEW.X WHERE Y=:OLD.X;--修改B表中的YE