[英]Update rows in table 'A' with value 'Y', for matching records from a different table 'B"
TESTDTA is the test database.
F41= First table
F42=Second table
Data from F41 TABLE 来自F41表格的数据
FLAG STORE NAME NUMBER
S 1 A A1
S 2 B B2
S 3 C C3
Data from F42 TABLE 来自F42表格的数据
STORE NAME NUMBER
1 A A1
2 B B2
3 C C3
4 D D4
I need to update values for the column "FLAG" in the tabel "F41" to value "P" if there is a matching record in the table "F42" . 如果表“ F42”中有匹配的记录,则需要将表“ F41”中列“ FLAG”的值更新为值“ P”。
I tried below SQL. 我尝试下面的SQL。 But it has syntax error.
但是它有语法错误。
UPDATE TESTDATA.F41,TESTDATA.F42 SET F41.FLAG='P'
WHERE F41.NAME=F42.NAME AND F41.NUMBER=F42.NUMBER
Can anyone help me to write this SQL? 谁能帮我写这个SQL吗?
Thanks in advance for your help 在此先感谢您的帮助
Perhaps a little cleaner 也许有点清洁
UPDATE F41 SET FLAG='P'
FROM F41 A
JOIN F42 B on A.NAME=B.NAME AND A.NUMBER=B.NUMBER
if your DBMS is Oracle and If by "matching records" you mean all column values in F41 match F42 then this might answer your problem: 如果您的DBMS是Oracle,并且如果通过“匹配记录”来表示F41中的所有列值都匹配F42,那么这可能会回答您的问题:
DDL: DDL:
create tabLe F41
(
FLAG varchar2(10)
,STORE_x number
,NAME_x varchar2(10)
,NUMBER_x varchar2(10)
);
create tabLe F42
(
STORE_x number
,NAME_x varchar2(10)
,NUMBER_x varchar2(10)
);
Note: Added _x to the Columns STORE, NAME, NUMBER because those are reserved words in some DBMS. 注意:在列STORE,NAME和NUMBER中添加了_x,因为它们是某些DBMS中的保留字。
DML: DML:
insert into F41 (FLAG, STORE_x, NAME_x, NUMBER_x) values ('S', 1, 'A', 'A1');
insert into F41 (FLAG, STORE_x, NAME_x, NUMBER_x) values ('S', 2, 'B', 'B2');
insert into F41 (FLAG, STORE_x, NAME_x, NUMBER_x) values ('S', 3, 'C', 'C3');
insert into F42 (STORE_x, NAME_x, NUMBER_x) values (1, 'A', 'A1');
insert into F42 (STORE_x, NAME_x, NUMBER_x) values (2, 'B', 'B2');
insert into F42 (STORE_x, NAME_x, NUMBER_x) values (3, 'C', 'C3');
insert into F42 (STORE_x, NAME_x, NUMBER_x) values (4, 'D', 'D4');
Update Statement Using Exists: 使用现有更新语句:
update F41 t1
set flag = 'P'
WHERE EXISTS (SELECT 1
FROM F42 t2
WHERE t2.STORE_X = t1.STORE_X
AND t2.NAME_X = t1.NAME_X
AND t2.NUMBER_X = t1.NUMBER_X);
Hope this Helps! 希望这可以帮助!
You can do this with nothing more fancy than a WHERE
clause: 您可以通过
WHERE
子句完成此操作:
UPDATE TESTDATA.F41
SET FLAG = 'P'
WHERE EXISTS (SELECT 1
FROM TESTDATE.F42
WHERE F41.NAME = F42.NAME AND F41.NUMBER = F42.NUMBER
);
This is standard SQL and should work in any database. 这是标准的SQL,可以在任何数据库中使用。
UPDATE TESTDATA.F41 SET F41.FLAG='P'
FROM TESTDATA.F42
WHERE F41.NAME = F42.NAME AND F41.NUMBER = F42.NUMBER
UPDATE TESTDATA.F41
SET FLAG = 'P'
WHERE EXISTS (SELECT 1
FROM TESTDATE.F42
WHERE F41.NAME = F42.NAME AND F41.NUMBER = F42.NUMBER
);
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