PTA Modified Girls Grade Score 10

SQL practice collection

This topic requires writing an UPDATE statement,

Increase the grades of all girls with a score below 75 by 5%;

Table Structure:

Please write the SQL statement that defines the table structure here. For example:

CREATE TABLE `stu` (
  `sno` char(4) NOT NULL,
  `sname` char(8) NOT NULL,
  `sex` tinyint(1) DEFAULT NULL,
  `mno` char(2) DEFAULT NULL,
  `birdate` datetime DEFAULT NULL,
  `memo` text,
  PRIMARY KEY (`sno`)
);
CREATE TABLE `sc` (
  `sno` char(4) NOT NULL,
  `cno` char(4) NOT NULL,
  `grade` decimal(6,1) DEFAULT NULL,
  PRIMARY KEY (`sno`,`cno`),
  CONSTRAINT `fk_sc_sno` FOREIGN KEY (`sno`) REFERENCES `stu` (`sno`)
)

table sample

Please give a table sample corresponding to the above table structure here. For example

Stu table:

sc table:

Sample output:

For example:

The sc table after modifying the girls' grades is as follows:

Code length limit 16 KB

Time limit 400 ms

DatabaseMySQL

update sc
set grade = grade*1.05
where grade < 75 and sno in (
    select sno 
    from stu 
    where sex = 0
)