CASE in WHERE clause in MySQL
I'm working in a project with MySQL and using stored procedures to make my SELECT queries,
so all of them have this same structure:
DELIMITER $$
CREATE PROCEDURE `case_in_where`(IN `column_index` INT, IN `value` VARCHAR(255))
BEGIN
SELECT * FROM `foo`
WHERE
CASE
WHEN `column_index` IS NULL THEN 1
WHEN `column_index` = 1 THEN `foo`.`column_1` = `value`
WHEN `column_index` = 2 THEN `foo`.`column_2` = `value`
END
;
END $$
DELIMITER ;
But I have seen that when people ask for help using this approach, usually the answers are that it should use AND, OR instead or Dynamic SQL. So, this way is not correct? It's a bad practice or have any difference in performance?
I should use AND, OR or Dynamic SQL or make different queries for every case?
Thanks beforehand.
mysql performance stored-procedures case where
asked 5 mins ago
Deus ArcanaDeus Arcana
11
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I'm working in a project with MySQL and using stored procedures to make my SELECT queries,
so all of them have this same structure:
DELIMITER $$
CREATE PROCEDURE `case_in_where`(IN `column_index` INT, IN `value` VARCHAR(255))
BEGIN
SELECT * FROM `foo`
WHERE
CASE
WHEN `column_index` IS NULL THEN 1
WHEN `column_index` = 1 THEN `foo`.`column_1` = `value`
WHEN `column_index` = 2 THEN `foo`.`column_2` = `value`
END
;
END $$
DELIMITER ;
But I have seen that when people ask for help using this approach, usually the answers are that it should use AND, OR instead or Dynamic SQL. So, this way is not correct? It's a bad practice or have any difference in performance?
I should use AND, OR or Dynamic SQL or make different queries for every case?
Thanks beforehand.
mysql performance stored-procedures case where
asked 5 mins ago
Deus ArcanaDeus Arcana
11
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm working in a project with MySQL and using stored procedures to make my SELECT queries,
so all of them have this same structure:
DELIMITER $$
CREATE PROCEDURE `case_in_where`(IN `column_index` INT, IN `value` VARCHAR(255))
BEGIN
SELECT * FROM `foo`
WHERE
CASE
WHEN `column_index` IS NULL THEN 1
WHEN `column_index` = 1 THEN `foo`.`column_1` = `value`
WHEN `column_index` = 2 THEN `foo`.`column_2` = `value`
END
;
END $$
DELIMITER ;
But I have seen that when people ask for help using this approach, usually the answers are that it should use AND, OR instead or Dynamic SQL. So, this way is not correct? It's a bad practice or have any difference in performance?
I should use AND, OR or Dynamic SQL or make different queries for every case?
Thanks beforehand.
mysql performance stored-procedures case where
asked 5 mins ago
Deus ArcanaDeus Arcana
11
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm working in a project with MySQL and using stored procedures to make my SELECT queries,
so all of them have this same structure:
DELIMITER $$
CREATE PROCEDURE `case_in_where`(IN `column_index` INT, IN `value` VARCHAR(255))
BEGIN
SELECT * FROM `foo`
WHERE
CASE
WHEN `column_index` IS NULL THEN 1
WHEN `column_index` = 1 THEN `foo`.`column_1` = `value`
WHEN `column_index` = 2 THEN `foo`.`column_2` = `value`
END
;
END $$
DELIMITER ;
But I have seen that when people ask for help using this approach, usually the answers are that it should use AND, OR instead or Dynamic SQL. So, this way is not correct? It's a bad practice or have any difference in performance?
I should use AND, OR or Dynamic SQL or make different queries for every case?
Thanks beforehand.
mysql performance stored-procedures case where
mysql performance stored-procedures case where
asked 5 mins ago
Deus ArcanaDeus Arcana
11
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 mins ago
Deus ArcanaDeus Arcana
11
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 mins ago
Deus ArcanaDeus Arcana
11
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 mins ago
Deus ArcanaDeus Arcana
11
asked 5 mins ago
Deus ArcanaDeus Arcana
11
11
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Deus Arcana is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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