I have csv file with below entries
user1,pwd1
user2,pwd2
.
.
usern,pwdn
I want to update pwd for the users in table1 respectively using sqlplus. How can I achieve this in shortest way.
Related
I'm building a project where the front end is react and the backend is ruby on rails and uses a postgres DB. I want to be able to export the response from the following query using Postgresql's built in COPY command and send it to the front end.
query = <<-SQL
SELECT * FROM ORDERS WHERE ORDERS.STORE_ID = ? OFFSET ? LIMIT ?
SQL
query_result = Order.find_by_sql([query, store_id.to_i, offset.to_i, 600000])
As you can see, my ruby code uses find_by_sql to execute the query and this allows me to enter the values for the ? placeholders. How do i fill these values in using Postgres Copy command? The query will return 600000 records so delegating the act of generating the CSV to PostgreSQL itself seems like a good idea. The issue is that I don't know how to do this when my query is parameterized to avoid SQL injection. Any help with sample ruby code would be great!
We can still use find_by_sql and just include the COPY in the query like this:
query = <<-SQL
COPY
(SELECT * FROM ORDERS WHERE ORDERS.STORE_ID = ? OFFSET ? LIMIT ?)
to '/path/temp/output.txt' WITH CSV HEADER
SQL
query_result = Order.find_by_sql([query, store_id.to_i, offset.to_i, 600000])
I have a Snowflake stored procedure and I want to use "insert into" without hard coding column names.
INSERT INTO MEMBERS_TARGET (ID, NAME)
SELECT ID, NAME
FROM MEMBERS_STREAM;
This is what I have and column names are hardcoded. The query should copy data from MEMBERS_STREAM to MEMBERS_TARGET. The stream has more columns such as
METADATA$ACTION | METADATA$ISUPDATE | METADATA$ROW_ID
which I am not intending to copy.
I don't know of a way to not copy the METADATA columns if not hardcoding. However if you don't want the data maybe the easiest thing to do is to add them to your target, INSERT using a SELECT * and later in the sp set them to NULL.
Alternatively, earlier in your sp, run an ALTER TABLE ADD COLUMN to add the columns, INSERT using SELECT * and then after that run an ALTER TABLE DROP COLUMN to remove the columns? That way your table structure stays the same, albeit briefly it will have some extra columns.
A SELECT * is not usually recommended but it's the easiest alternative I can think of
I have an Influxdb with lots of fields and a single tag:
> show tag keys
name: rtl433
tagKey
------
model
Now, I want a list of all possible values for model, so I run
SELECT model FROM rtl433
>
-and it returns nothing. Why? There's lots of data in model if I select *.
You are trying to use classic SQL solution, but InfluxDB is not classic SQL DB. You should check InfluxDB doc and you will find solution:
SHOW TAG VALUES WITH KEY = "model"
I am a beginner with InfluxDB and I've read the intro documentation, but cannot find any details on how to create a new measurement. Am I missing something ?
As noted in the comments, to "create" a new measurement you simply insert data into that measurement.
For example
$ influx
> CREATE DATABASE mydb
> USE mydb
Using database mydb
> SHOW MEASUREMENTS
> INSERT cpu,host=serverA value=10
> SHOW MEASUREMENTS
name: measurements
name
----
cpu
> INSERT mem,host=serverA value=10
> SHOW MEASUREMENTS
name: measurements
name
----
cpu
mem
In INFLUX DB , you cant create empty measurements.
You need to add some data as well.
For Example,
INSERT xyz,name=serverA value=10,count=10
This will create a measurement name xyz where
tag keys : name
field keys : value & count
You can check Field and tag keys by executing show field keys or show tag keys.
In the INSERT command, the format is like :
measurement_name,tag keys + value separated by comma Field keys with value separated by comma
eg: INSERT xyz,name=serverA value=10,count=10
In this way, you can create measurement with specifying your required field and tag keys.
You cannot create an empty measurement, afaik.
Like they said above, if you want one you need to start writing to it and that should take care of creating one along with some data in it.
insert load,app_name=app3,groupname=second,performance=degraded uuid=003,loading=50,frequency=1
In the above, we are using "insert" to write new data into a new measurement called "load".
app_name,groupname,performance are 'tags' and uuid,loading,frequency are fields
create database <data base name of your choice>
create user "<username>" with password '<password>'
To see the all databases: SHOW DATABASES
Enter the Database: use <database name>
To see all tables inside the database: SHOW MEASUREMENTS
grant all on <data base name> to <username>
insert data (Here Motionsense is a Measurement which is similar to the table name of SQL): INSERT MotionSense,SensorType=Gyro roll=1.2,yaw=5,pitch=3
See the data of the Measurements: SELECT * FROM "MotionSense"
I have my_db1, my_db2, my_db3 in Influxdb, now is there a way to move or copy data between these databases with a query?
InfluxQL provides an INTO clause that can be used to copy data between databases.
For example, if I had the point cpu,host=server1 value=100 123 in db_1 and wanted to copy that data to the point new_cpu,host=server1 value=100 123 in db_2. I could issue the following query:
SELECT * INTO db_2..new_cpu FROM db_1..cpu group by *
For more information, see the documentation