How can I do three table JOINs in an UPDATE query? - mysql

I asked a question and got this reply which helped.
UPDATE TABLE_A a JOIN TABLE_B b
ON a.join_col = b.join_col AND a.column_a = b.column_b
SET a.column_c = a.column_c + 1
Now I am looking to do this if there are three tables involved something like this.
UPDATE tableC c JOIN tableB b JOIN tableA a
My question is basically... is it possible to do three table joins on an UPDATE statement? And what is the correct syntax for it?
Do I do the following?
JOIN tableB, tableA
JOIN tableB JOIN tableA


The answer is yes, you can.
Try it like this:
UPDATE TABLE_A a
JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
For a general update join:
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]


An alternative way of achieving the same result is not to use the JOIN keyword at all.
UPDATE TABLE_A, TABLE_B
SET TABLE_A.column_c = TABLE_B.column_c + 1
WHERE TABLE_A.join_col = TABLE_B.join_col


Below is the update query which includes both JOIN and WHERE. In the same way, we can use multiple join/where clauses:
UPDATE opportunities_cstm oc JOIN opportunities o ON oc.id_c = o.id
SET oc.forecast_stage_c = 'APX'
WHERE o.deleted = 0
AND o.sales_stage IN('ABC','PQR','XYZ')


An alternative general plan:
UPDATE table A
JOIN table B ON {join fields}
JOIN table C ON {join fields}
JOIN {as many tables as you need}
SET A.column = {expression}
Example:
UPDATE person P
JOIN address A ON P.home_address_id = A.id
JOIN city C ON A.city_id = C.id
SET P.home_zip = C.zipcode;


Yes, you can do a thre-table join for an update statement. Here is an example:
UPDATE customer_table c
JOIN
employee_table e
ON c.city_id = e.city_id
JOIN
anyother_ table a
ON a.someID = e.someID
SET c.active = "Yes"
WHERE c.city = "New york";


For a PostgreSQL example:
UPDATE TableA AS a
SET param_from_table_a=FALSE -- param FROM TableA
FROM TableB AS b
WHERE b.id=a.param_id AND a.amount <> 0;


none of answer does not work for me I find this on mysql manual
UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition

Related

Inserting Data in columns corresponding to data in other column [duplicate]

I asked a question and got this reply which helped.
UPDATE TABLE_A a JOIN TABLE_B b
ON a.join_col = b.join_col AND a.column_a = b.column_b
SET a.column_c = a.column_c + 1
Now I am looking to do this if there are three tables involved something like this.
UPDATE tableC c JOIN tableB b JOIN tableA a
My question is basically... is it possible to do three table joins on an UPDATE statement? And what is the correct syntax for it?
Do I do the following?
JOIN tableB, tableA
JOIN tableB JOIN tableA

The answer is yes, you can.
Try it like this:
UPDATE TABLE_A a
JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
For a general update join:
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]

An alternative way of achieving the same result is not to use the JOIN keyword at all.
UPDATE TABLE_A, TABLE_B
SET TABLE_A.column_c = TABLE_B.column_c + 1
WHERE TABLE_A.join_col = TABLE_B.join_col

Below is the update query which includes both JOIN and WHERE. In the same way, we can use multiple join/where clauses:
UPDATE opportunities_cstm oc JOIN opportunities o ON oc.id_c = o.id
SET oc.forecast_stage_c = 'APX'
WHERE o.deleted = 0
AND o.sales_stage IN('ABC','PQR','XYZ')

An alternative general plan:
UPDATE table A
JOIN table B ON {join fields}
JOIN table C ON {join fields}
JOIN {as many tables as you need}
SET A.column = {expression}
Example:
UPDATE person P
JOIN address A ON P.home_address_id = A.id
JOIN city C ON A.city_id = C.id
SET P.home_zip = C.zipcode;

Yes, you can do a thre-table join for an update statement. Here is an example:
UPDATE customer_table c
JOIN
employee_table e
ON c.city_id = e.city_id
JOIN
anyother_ table a
ON a.someID = e.someID
SET c.active = "Yes"
WHERE c.city = "New york";

For a PostgreSQL example:
UPDATE TableA AS a
SET param_from_table_a=FALSE -- param FROM TableA
FROM TableB AS b
WHERE b.id=a.param_id AND a.amount <> 0;

none of answer does not work for me I find this on mysql manual
UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition

MySQL Nested Update Statement failing [duplicate]

I asked a question and got this reply which helped.
UPDATE TABLE_A a JOIN TABLE_B b
ON a.join_col = b.join_col AND a.column_a = b.column_b
SET a.column_c = a.column_c + 1
Now I am looking to do this if there are three tables involved something like this.
UPDATE tableC c JOIN tableB b JOIN tableA a
My question is basically... is it possible to do three table joins on an UPDATE statement? And what is the correct syntax for it?
Do I do the following?
JOIN tableB, tableA
JOIN tableB JOIN tableA

The answer is yes, you can.
Try it like this:
UPDATE TABLE_A a
JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
For a general update join:
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]

An alternative way of achieving the same result is not to use the JOIN keyword at all.
UPDATE TABLE_A, TABLE_B
SET TABLE_A.column_c = TABLE_B.column_c + 1
WHERE TABLE_A.join_col = TABLE_B.join_col

Below is the update query which includes both JOIN and WHERE. In the same way, we can use multiple join/where clauses:
UPDATE opportunities_cstm oc JOIN opportunities o ON oc.id_c = o.id
SET oc.forecast_stage_c = 'APX'
WHERE o.deleted = 0
AND o.sales_stage IN('ABC','PQR','XYZ')

An alternative general plan:
UPDATE table A
JOIN table B ON {join fields}
JOIN table C ON {join fields}
JOIN {as many tables as you need}
SET A.column = {expression}
Example:
UPDATE person P
JOIN address A ON P.home_address_id = A.id
JOIN city C ON A.city_id = C.id
SET P.home_zip = C.zipcode;

Yes, you can do a thre-table join for an update statement. Here is an example:
UPDATE customer_table c
JOIN
employee_table e
ON c.city_id = e.city_id
JOIN
anyother_ table a
ON a.someID = e.someID
SET c.active = "Yes"
WHERE c.city = "New york";

For a PostgreSQL example:
UPDATE TableA AS a
SET param_from_table_a=FALSE -- param FROM TableA
FROM TableB AS b
WHERE b.id=a.param_id AND a.amount <> 0;

none of answer does not work for me I find this on mysql manual
UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition

SQL copy data from to another table based on 2 matched column values [duplicate]

I asked a question and got this reply which helped.
UPDATE TABLE_A a JOIN TABLE_B b
ON a.join_col = b.join_col AND a.column_a = b.column_b
SET a.column_c = a.column_c + 1
Now I am looking to do this if there are three tables involved something like this.
UPDATE tableC c JOIN tableB b JOIN tableA a
My question is basically... is it possible to do three table joins on an UPDATE statement? And what is the correct syntax for it?
Do I do the following?
JOIN tableB, tableA
JOIN tableB JOIN tableA

The answer is yes, you can.
Try it like this:
UPDATE TABLE_A a
JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
For a general update join:
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]

An alternative way of achieving the same result is not to use the JOIN keyword at all.
UPDATE TABLE_A, TABLE_B
SET TABLE_A.column_c = TABLE_B.column_c + 1
WHERE TABLE_A.join_col = TABLE_B.join_col

Below is the update query which includes both JOIN and WHERE. In the same way, we can use multiple join/where clauses:
UPDATE opportunities_cstm oc JOIN opportunities o ON oc.id_c = o.id
SET oc.forecast_stage_c = 'APX'
WHERE o.deleted = 0
AND o.sales_stage IN('ABC','PQR','XYZ')

An alternative general plan:
UPDATE table A
JOIN table B ON {join fields}
JOIN table C ON {join fields}
JOIN {as many tables as you need}
SET A.column = {expression}
Example:
UPDATE person P
JOIN address A ON P.home_address_id = A.id
JOIN city C ON A.city_id = C.id
SET P.home_zip = C.zipcode;

Yes, you can do a thre-table join for an update statement. Here is an example:
UPDATE customer_table c
JOIN
employee_table e
ON c.city_id = e.city_id
JOIN
anyother_ table a
ON a.someID = e.someID
SET c.active = "Yes"
WHERE c.city = "New york";

For a PostgreSQL example:
UPDATE TableA AS a
SET param_from_table_a=FALSE -- param FROM TableA
FROM TableB AS b
WHERE b.id=a.param_id AND a.amount <> 0;

none of answer does not work for me I find this on mysql manual
UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition

UPDATE SET information from 3 tables

table_a (item_id, item_desc)
table_b (item_id, item_name)
table_c (item_name, item_desc)
I need to set table_a.item_desc=table_c.item_desc
No matter what am I doing I'm still getting errors.
This is my final work:
UPDATE table_a
SET table_a.item_desc = table_c.item_desc
FROM table_a
INNER JOIN table_b
ON table_a.item_id = table_b.item_id
INNER JOIN table_c
ON table_b.item_name = table_c.item_name;

You have syntax error. In MySQL you don't need to add FROM clause when using UPDATE with JOIN.
Also add table alias for better readability.
UPDATE table_a A
INNER JOIN table_b B ON A.item_id = B.item_id
INNER JOIN table_c C ON B.item_name = C.item_name
SET A.item_desc = C.item_desc ;

In MySQL the join part goes right after the update keyword, not to the end of the statement:
UPDATE table_a
INNER JOIN table_b ON table_a.item_id = table_b.item_id
INNER JOIN table_c ON table_b.item_name = table_c.item_name
SET table_a.item_desc = table_c.item_desc;

Try this as in Update JOIN will be used before SET
UPDATE table_a
INNER JOIN table_b ON table_a.item_id = table_b.item_id
INNER JOIN table_c ON table_b.item_name = table_c.item_name
SET table_a.item_desc = table_c.item_desc;

In real-time, How to update the value of a column in one table with the value of a column in another table [duplicate]

I asked a question and got this reply which helped.
UPDATE TABLE_A a JOIN TABLE_B b
ON a.join_col = b.join_col AND a.column_a = b.column_b
SET a.column_c = a.column_c + 1
Now I am looking to do this if there are three tables involved something like this.
UPDATE tableC c JOIN tableB b JOIN tableA a
My question is basically... is it possible to do three table joins on an UPDATE statement? And what is the correct syntax for it?
Do I do the following?
JOIN tableB, tableA
JOIN tableB JOIN tableA

The answer is yes, you can.
Try it like this:
UPDATE TABLE_A a
JOIN TABLE_B b ON a.join_col = b.join_col AND a.column_a = b.column_b
JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
For a general update join:
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]

An alternative way of achieving the same result is not to use the JOIN keyword at all.
UPDATE TABLE_A, TABLE_B
SET TABLE_A.column_c = TABLE_B.column_c + 1
WHERE TABLE_A.join_col = TABLE_B.join_col

Below is the update query which includes both JOIN and WHERE. In the same way, we can use multiple join/where clauses:
UPDATE opportunities_cstm oc JOIN opportunities o ON oc.id_c = o.id
SET oc.forecast_stage_c = 'APX'
WHERE o.deleted = 0
AND o.sales_stage IN('ABC','PQR','XYZ')

An alternative general plan:
UPDATE table A
JOIN table B ON {join fields}
JOIN table C ON {join fields}
JOIN {as many tables as you need}
SET A.column = {expression}
Example:
UPDATE person P
JOIN address A ON P.home_address_id = A.id
JOIN city C ON A.city_id = C.id
SET P.home_zip = C.zipcode;

Yes, you can do a thre-table join for an update statement. Here is an example:
UPDATE customer_table c
JOIN
employee_table e
ON c.city_id = e.city_id
JOIN
anyother_ table a
ON a.someID = e.someID
SET c.active = "Yes"
WHERE c.city = "New york";

For a PostgreSQL example:
UPDATE TableA AS a
SET param_from_table_a=FALSE -- param FROM TableA
FROM TableB AS b
WHERE b.id=a.param_id AND a.amount <> 0;

none of answer does not work for me I find this on mysql manual
UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition