Im looking to make work this statement in MySql, I need to pass the value from table domains column webId only if this value is different than 0, and if so, I need it to copy this value into table customers column referwebId. The below code is giving me error: Unknown table 'domains' in field list..
What is wrong?
Thank you
BEGIN
if domains.webId NOT LIKE '0' then
insert into customers (referWebId) select
webId from domains;
END IF;
END
Why not do something like this
insert into customers (referWebId)
select webId from domains
where webId NOT LIKE '0';
Per your posted code you can't simply check like that way
if domains.webId NOT LIKE '0' then
Rather use INSERT ... ON DUPLICATE KEY UPDATE like below
insert into customers (referWebId)
select webId from domains where webId NOT LIKE '0'
on duplicate key update referWebId = values(referWebId);
Related
I am trying to solve the problem with insert new value into table. Primary key is ID not email... Before insert i need check other records for email value. If no one match inserted email, data is inserted. But i canot write correct code for that...
IF EXIST (SELECT email FROM users WHERE email = "email")
THEN
BEGIN
'We Have Records of this Customer'
END
ELSE
BEGIN
INSERT INTO users
VALUES (null,'email9','password9','forename9','lastname9')
END
END IF
Or:
IF SELECT COUNT(*) FROM users WHERE email = 'email' > 0
THEN
BEGIN
//email exist
END
ELSE
BEGIN
//inserting
END
END IF
This looks like a good use case for MySQL INSERT ... ON DUPLICATE KEY UPDATE syntax.
First of all, you want to create a UNIQUE constraint on column email. This is the proper way to represent your business rule:
ALTER TABLE users ADD CONSTRAINT users_unique_email UNIQUE (email);
Now, if the record that is about to be inserted would generate a duplicate on the primary key or on that UNIQUE constraint, then MySQL lets you turn the operation to an UPDATE instead.
In your case, since you want not to update anything in that case, you can simply re-assign the email column (which we know is the same here).
Consider:
INSERT INTO users
VALUES (null,'email9','password9','forename9','lastname9')
ON DUPLICATE KEY UPDATE SET email = 'mail9';
I cant comment, but I post this. I recommend making an external script like in python or java to do this for you by selecting * and parsing through the output because SQL itself does not have the power to do this.
I want to insert a value into a table. However that value comes from that table too. And I want to check if there is a duplicate key on that table. Since this value come from that table too, the query says that a column name is ambiguous.
$result2 = "INSERT INTO estock_saldo
(items, customer_id, quantity , reference_no, size)
SELECT
items, '".$member_id."', '".$quantity[$i]."', reference_no, size
FROM
estock_saldo
WHERE id in ({$order_id[$i]})
ON DUPLICATE KEY
UPDATE estock_saldo.quantity = estock_saldo.quantity - '".$quantity[$i]."'";
$res2 = $mysqli->query($result2);
if(!$res2){ printf("Errormessage 2: %s\n", $mysqli->error); die(); }
The ambiguous come from estock_saldo.quantity. I have tried to alias the column name. However you can't do that in insert table.
Problem persist in the below shown code snippet. You can't use column alias in INSERT statement.
INSERT INTO estock_saldo
(items, customer_id, quantity AS asquan
<-- HERE
What you are trying will always have a duplicate entry, since you are inserting the same record again. Instead of INSERT statement, you actually meant to do a UPDATE like
UPDATE estock_saldo SET
quantity = quantity - '".$quantity[$i]."'"
WHERE id in ({$order_id[$i]});
I need to create a query to insert some records, the record must be unique. If it exists I need the recorded ID else if it doesnt exist I want insert it and get the new ID. I wrote that query but it doesnt work.
SELECT id FROM tags WHERE slug = 'category_x'
WHERE NO EXISTS (INSERT INTO tags('name', 'slug') VALUES('Category X','category_x'));
It's called UPSERT (i.e. UPdate or inSERT).
INSERT INTO tags
('name', 'slug')
VALUES('Category X','category_x')
ON DUPLICATE KEY UPDATE
'slug' = 'category_x'
MySql Reference: 13.2.5.3. INSERT ... ON DUPLICATE KEY UPDATE Syntax
Try something like...
IF (NOT EXISTS (SELECT id FROM tags WHERE slug = 'category_x'))
BEGIN
INSERT INTO tags('name', 'slug') VALUES('Category X','category_x');
END
ELSE
BEGIN
SELECT id FROM tags WHERE slug = 'category_x'
END
But you can leave the ELSE part and SELECT the id, this way the query will always return the id, irrespective of the insert...
MySQL has nice REPLACE. It is easy to use and remember it's syntax as same as INSERT.
in you case, just run following query.
REPLACE INTO tags('name', 'slug') VALUES('Category X','category_x')
It acts like INSERT when no unique constraint violation. If duplicated value found on PK or UNIQUE key, then other columns will be UPDATED with given values. It is done by DELETE duplicated record and INSERT new record.
I'm trying to create a simple table where I insert field and I do some checks in MySql. I've used Microsoft SQL relatively easy. Instead, MySql give evrrytime query errors without even specifying what's going on. Poor MySql software design apart, here's what I'm trying to do:
1 table with 4 fields with an autoincremental autogenerated number to det an ID as primary key
CREATE TABLE `my_db`.`Patients_table` (
`ID_Patient` INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`Patient_name` VARCHAR( 200 ) NOT NULL ,
`Recovery_Date` DATETIME NOT NULL ,
`Recovery_count` INT NOT NULL
) ENGINE = MYISAM
a simple stored procedure to insert such fields and check if something exist before inserting:
CREATE PROCEDURE nameInsert(IN nome, IN data)
INSERT INTO Patients_table (Patient_name,Recovery_Date) values (nome,data)
IF (EXISTS (SELECT Recovery_count FROM Tabella_nomi) = 0) THEN
INSERT INTO (Patients_table (Recovery_count)
ELSE
SET Recovery_count = select Recovery_count+1 from Patients_table
END
this seems wrong on many levels and MySQL useless syntax checker does not help.
How can I do this? Thanks.
There seems to be a lot wrong with this block of code. (No offense intended!)
First, Procedures need to be wrapped with BEGIN and END:
CREATE PROCEDURE nameInsert(IN nome, IN data)
BEGIN
...[actually do stuff here]
END
Second, since your table is declared with all fields as NOT NULL, you must insert all fields with an INSERT statement (this includes the Recovery_Date column, and excludes the AUTO_INCREMENT column). You can add DEFAULT CURRENT_TIMESTAMP to the date column if you want it to be set automatically.
INSERT INTO Patients_table (Patient_name,Recovery_Date) values (nome,data)
Third, what exactly is your IF predicate doing?
EXISTS (SELECT Recovery_count FROM Tabella_nomi) = 0
If you want to check if a row exists, don't put the = 0 at the end. Also, Tabella_nomi isn't declared anywhere in that procedure. Also, your SELECT statement should have a WHERE clause, since I'm assuming you want to select a specific row (this is going to select a result set of all recovery_counts).
Fourth, the second INSERT statement seems a little messy. It should look more like the first INSERT, and keep the point I made above in mind.
INSERT INTO (Patients_table (Recovery_count)
Fifth, the ELSE statement
SET Recovery_count = select Recovery_count+1 from Patients_table
Has some problems too. SET is meant for setting variables, not values in rows. I'm not 100% sure what your intent is from this statement, but it looks like you meant to increment the Recovery_count column of a certain row if it already exists. In which case, you meant to do something like this:
UPDATE Patients_table SET Recovery_count = Recovery_count+1 WHERE <conditional predicate>
Where the conditional predicate is something like this:
Patients_name = nome
Try these things, and look at the errors it gives you when you try to execute the CREATE STATEMENT. I bet they're more useful then you think!
I have a simple table like this
CREATE TABLE authid(
id INT NOT NULL AUTO_INCREMENT,
authid VARCHAR(128) NOT NULL UNIQUE,
PRIMARY KEY(id)
);
Now if I insert a value with
INSERT INTO authid(authid) VALUES('test');
It will work fine and return the inserted id the first time, but if I do it again when the authid already exists (notice that we have authid marked as UNIQUE) it will return an error.
Is there a way achieve this this in one SQL statement: Insert it, get the id and if it already exists, still get the id.
Take a look at this: http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html
If you're using MySQL 5.0 or higher you can use the "INSERT ... ON DUPLICATE KEY UPDATE" syntax. You may be able to combine that with LAST_INSERT_ID() (I'm not positive about that)
So:
insert into authid (authid) values ('test') on duplicate key update id=LAST_INSERT_ID(id), authid='test';
select LAST_INSERT_ID();
Well indeed if you try to insert 2 times the same value in a UNIQUE field, it won't work, that's the point of UNIQUE fields.
If I understand well, you want to know if it's possible whether to use an INSERT or an UPDATE statement depending on the existance of an item or not ? Then you need 2 queries, 1 to test existence, the other to insert new value or update existing one
Insert the value conditionally (i.e. if it doesn't exist). Whether the insert takes place or not, by the end of the statement the result will be the same: the value will be in the table. So, just select the ID of the row that matches that value. Or, speaking in SQL, like this:
INSERT INTO authid (authid)
SELECT 'test'
WHERE NOT EXISTS (
SELECT *
FROM authid
WHERE authid = 'test'
);
SELECT id
FROM authid
WHERE authid = 'test'
;