Question

我有3个表，table1和table2有数据。我需要将这些数据推送/插入到其他表中。

PFA图片：

PLZ帮助我获得最终结果表

提前致谢

我尝试了node.js

这里table1是companyAsc，table2 personAsc和table3 country_associate

connection.query（＆＃39; SELECT * FROM companyAsc＆＃39;，function（err，rows，fields） {

        if (!err) {
            if(rows.length == 0){
            }else{

                var str = JSON.stringify(rows)
                var parsed2 = JSON.parse(str);

                connection.query('SELECT * FROM personAsc', function(err, rows, fields)
                {

                    if (!err) {
                        if(rows.length == 0){

                        } else{

                            var str = JSON.stringify(rows)
                            var parsed3 = JSON.parse(str);
                            //company_id = parsed2[0].id;
                            if(parsed2.length>parsed3.length){
                                console.log("1")

                                for(i=0;i<parsed2.length;i++){
                                    var person_id;
                                        var company_id  = parsed2[i].company_id;
                                        var country_id  = parsed2[i].country_id;

                                        if(parsed3[i]!=undefined){
                                            person_id  = parsed3[i].person_id;
                                        }else{
                                            person_id  = 3725;
                                        }

                                        connection.query('insert into country_associate(country_id,company_id,person_id) values ("'+country_id+'","'+company_id+'","'+person_id+'")',function(err, rows, fields){
                                            if (err) console.log(err);
                                            else{
                                                console.log("inserted");
                                            }
                                        });      

                                    }
                            } else{
                                for(i=0;i<parsed3.length;i++){
                                    var company_id;
                                    //var person_id  = parsed3[i].person_id;
                                    var country_id  = parsed3[i].country_id;
                                    if(parsed2[i]!=undefined){
                                        company_id  = parsed2[i].company_id;
                                    }else{
                                        company_id  = 1317;
                                    }

                                    if(parsed3[i]!=undefined){
                                        person_id  = parsed3[i].person_id;
                                    }else{
                                        person_id  = 3725;
                                    }

                                    connection.query('insert into country_associate(country_id,company_id,person_id) values ("'+parsed2[i].country_id+'","'+company_id+'","'+person_id+'")',function(err, rows, fields){
                                        if (err) console.log(err);
                                        else{
                                            console.log("inserted");
                                        }
                                    });

                                }

                            }

                        }

                    }else{
                        console.log(err)
                    }
                });

            }

        }else{
            console.log(err)
        }
    });

Answer 1

由于MySql不支持完全外连接使用union，因此它们是等效的

INSERT INTO Table3 (A, B, C)
SELECT Table1.A, Table1.B, Table2.C FROM Table1 t1
LEFT JOIN Table2 t2 ON t1.A = t2.A
UNION
SELECT Table1.A, Table1.B, Table2.C FROM Table1 t1
RIGHT JOIN Table2 t2 ON t1.A = t2.A

Answer 2

insert into table3 (a, b, c)
(SELECT  table1.a, table1.b, table2.c 
from table1, table2
where table1.a = table2.a);

您的问题不明确，您尝试了什么？

使用相同的ID MySQL将两个不同表的值插入到新表中

2 个答案: