如何在 postgresql 数据库中执行此查询我在执行时遇到了麻烦

Question

如何解决这个错误，我遇到了麻烦运行那个查询是任何人请帮助执行带有所有属性的查询。

PG_QUERY:-

UPDATE mapschema_127_17.layertable_2156_17 AS a 
SET "area(sqkm)" = newvalues.area(sqkm),
    "county" = newvalues.county,
    "countyfp" = newvalues.countyfp,
    "geoid" = newvalues.geoid,
    "gid" = newvalues.gid,
    "land(sqm)" = newvalues.land(sqm),
    "state" = newvalues.state,
    "statefp" = newvalues.statefp,
    "stusps" = newvalues.stusps,
    "water(sqm)" = newvalues.water(sqm) 
FROM 
    (VALUES ('2813.807491', 'Rich County', '033', '49033', 1, '2664700959', 'Utah', '49', 'UT', '149106532'),
            ('3037.725199', 'Cache County', '005', '49005', 2, '3016627502', 'Utah', '49', 'UT', '21097697'),
            ('8418.300607', 'Duchesne County', '013', '49013', 3, '8379502802', 'Utah', '49', 'UT', '38797805'),
            ('9543.91397', 'Grand County', '019', '49019', 28, '9512361692', 'Utah', '49', 'UT', '31552278'),
            ('18870.630612', 'Tooele County', '045', '49045', 29, '17979556898', 'Utah', '49', 'UT', '891073714')) AS newvalues ("area(sqkm)", "county", "countyfp", "geoid", "gid", "land(sqm)", "state", "statefp", "stusps", "water(sqm)") 
WHERE a.gid = newvalues.gid

错误：

ERROR: column "sqkm" does not exist LINE 1: ...able_2156_17 as a SET "area(sqkm)"=newvalues.area(sqkm),"cou... ^

其中 area(sqkm) 是双精度数据类型的列名。

Answer 1

允许在对象名称中使用特殊字符 - 通过用引号将其括起来 " -，但这常常会导致混淆。这个列名非常奇怪的例子可能会让事情更清楚：

演示：db<>fiddle

CREATE TABLE t ("(id)" int, "#(txt)" text);
INSERT INTO t VALUES (1,'foo');

UPDATE t SET "#(txt)" = newvalues."#(txt)"
FROM (VALUES (1,'bar')) newvalues ("(id)","#(txt)")
WHERE t."(id)" = newvalues."(id)";

SELECT * FROM t;

 (id) | #(txt) 
------+--------
    1 | bar

这应该可以解决您的查询：

UPDATE mapschema_127_17.layertable_2156_17 AS a 
SET "area(sqkm)"=newvalues."area(sqkm)",
    "county"=newvalues."county",
    "countyfp"=newvalues."countyfp",
    "geoid"=newvalues."geoid",
    "gid"=newvalues."gid",
    "land(sqm)"=newvalues."land(sqm)",
    "state"=newvalues."state",
    "statefp"=newvalues."statefp",
    "stusps"=newvalues."stusps",
    "water(sqm)"=newvalues."water(sqm)" 
FROM 
  (VALUES 
    (2813.807491,'Rich County','033','49033',1,'2664700959','Utah','49','UT','149106532'),
    (3037.725199,'Cache County','005','49005',2,'3016627502','Utah','49','UT','21097697'),
    (8418.300607,'Duchesne County','013','49013',3,'8379502802','Utah','49','UT','38797805'),
    (9543.91397,'Grand County','019','49019',28,'9512361692','Utah','49','UT','31552278'),
    (18870.630612,'Tooele County','045','49045',29,'17979556898','Utah','49','UT','891073714')) AS newvalues ("area(sqkm)","county","countyfp","geoid","gid","land(sqm)","state","statefp","stusps","water(sqm)") 
WHERE a."gid" = newvalues."gid";

如何在 postgresql 数据库中执行此查询我在执行时遇到了麻烦

How to execute this query in postgresql database i was in trouble to execute that

sql

postgresql

postgis