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[英]How to extract values from a XML column in SQL and insert into new columns?
[英]How to insert content of multiple columns into a new column in sql?
我想组合两列的内容并将其插入新列。
但它不起作用。 例:
create table car(
id bigint NOT NULL,
manufacture character varying(255),
number character varying(255),
result character varying(255)
)
insert into car (result)
select concat(manufacture, ' ', number) from car
结果:
ERROR: NULL-Value in column „id“ error Not-Null-Constraint
DETAIL: Failed line contains (null, null, null, bmw 123).
如何更新特定行,并保留所有其他值?
update car set result = concat(manufacture, ' ', number)
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