如何在mysql中将一个表作为值插入另一个表?

时间:2016-03-09 02:10:38

标签: mysql database sql-insert

我有这两个表,第一个叫做item_coordinates,类型是INT,DOUBLE,DOUBLE

itemID       | latitude  |  longitude
-------------+-----------+-----------
1679323860   | 36.531398 |  -82.98085
1679340420   | 29.178171 | -74.075391
1679386982   | 40.73235  |   -94.6884

现在我有另一个名为Geocoordinates的表,我创建了这个表如下:

CREATE TABLE Geocoordinates (ItemID INT PRIMARY KEY,
 Geo_Coordinates POINT) ENGINE = MyISAM;

现在我想将表1中的值插入到表2中,但不断收到错误消息。这是我的尝试:

INSERT INTO Geocoordinates (ItemID, Geo_Coordinates) VALUES (item_id, 
POINT(latitude, longitude)) SELECT item_id, latitude, longitude FROM 
item_coordinates);

提前致谢。

2 个答案:

答案 0 :(得分:0)

我认为您需要使用CONCAT函数将lat / long分组为一个字段

INSERT INTO Geocoordinates (ItemID, Geo_Coordinates) VALUES (item_id, 
POINT(latitude, longitude)) SELECT item_id, CONCAT(latitude, longitude) FROM item_coordinates);

在这种情况下,我不认为需要POINT。

答案 1 :(得分:0)

使用INSERT INTO SELECT,不应指定VALUES关键字。以下是完整的演示。

SQL:

-- Data
create table item_coordinates( itemID bigint,  latitude decimal(10,6), longitude decimal(10,6));
CREATE TABLE Geocoordinates (ItemID INT PRIMARY KEY,
 Geo_Coordinates POINT) ENGINE = MyISAM;
INSERT INTO item_coordinates values
(1679323860   , 36.531398 ,  -82.98085),
(1679340420   , 29.178171 , -74.075391),
(1679386982   , 40.73235  ,   -94.6884);
SELECT * FROM item_coordinates;

-- SQL needed
INSERT INTO Geocoordinates (itemID, Geo_Coordinates)  SELECT itemID, POINT(latitude, longitude)  FROM item_coordinates;
SELECT itemID, ST_AsText(Geo_Coordinates) FROM Geocoordinates;

输出:

mysql> SELECT * FROM item_coordinates;
+------------+-----------+------------+
| itemID     | latitude  | longitude  |
+------------+-----------+------------+
| 1679323860 | 36.531398 | -82.980850 |
| 1679340420 | 29.178171 | -74.075391 |
| 1679386982 | 40.732350 | -94.688400 |
+------------+-----------+------------+
3 rows in set (0.00 sec)

mysql> INSERT INTO Geocoordinates (itemID, Geo_Coordinates)  SELECT itemID, POINT(latitude, longitude)  FROM item_coordinates;
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> SELECT itemID, ST_AsText(Geo_Coordinates) FROM Geocoordinates;
+------------+-----------------------------+
| itemID     | ST_AsText(Geo_Coordinates)  |
+------------+-----------------------------+
| 1679323860 | POINT(36.531398 -82.98085)  |
| 1679340420 | POINT(29.178171 -74.075391) |
| 1679386982 | POINT(40.73235 -94.6884)    |
+------------+-----------------------------+
3 rows in set (0.00 sec)