I know how to get the column_names from a table in oracle sql.
My question is, is it possible to actually use those column_names in a query?
I can get the column names like this:
SELECT column_name FROM user_tab_cols
WHERE table_name = 'MY_TABLE'
But it just returns a list of column names I cannot do anything with.
Is it possible to use those in a query?
I need to query a bunch of columns in a table and need to grab the column names dynamically so they are not hard coded in there...
Any tips?
You can't do it with just raw SQL, you must use PL/SQL.
So you have to use a stored procedure and do something like that :
SELECT 'SELECT '||LISTAGG(COLUMN_NAME,',')||' FROM /* your condition hew */' INTO myQuery FROM USER_TAB_COLS WHERE table_name = 'OFFER';
And then use OPEN ... LOOP to retrieve your data.
It's just a suggestion, and I found it very complex!
you will have to create a dynamic sql statement, and use the EXECUTE IMMEDIATE call on the sql statement you generate.
Related
I am using the sql command SHOW COLUMNS in this way
SHOW COLUMNS FROM TABLE A;
It outputs multiple columns, specifically one called 'COLUMN_NAME' that I would like to select.
I tried doing
SELECT COLUMN_NAME FROM (SHOW COLUMNS FROM TABLE A);
which gives an error, is there another way I can just show one of the columns of the output? Is this because the output is not a table so I cannot query from it?
You can use the like function:
show columns like 'COLUMN_NAME' in table A;
There are limitations on using the output of the show command, so an alternate approach is to use the INFORMATION_SCHEMA.
select * from INFORMATION_SCHEMA.COLUMNS where
TABLE_SCHEMA = 'MY_SCHEMA'
and TABLE_NAME = 'A'
and COLUMN_NAME = 'COLUMN_NAME';
If you need to query the results of a show command, you can use the result_scan table function:
show columns like '%' in table t1;
select * from table(result_scan(last_query_id())) where "column_name" = 'COLUMN_NAME';
Remember to double quote the column names produced by the show command. It's a metadata result and the column names are lower case.
I am trying to build a query to fetch columns from the system.CATALOG table and to continue querying based on the resultset. I looked at a few queries but seem to be unable to find anything that satisfies my requirements. I don't have much to show, that I have tried as I don't know, how to approach this.
I am using Apache Phoenix DB. (Any SQL is also OK, as I am interested in learning.)
I have now written the query below, which will fetch me all the column names, that start with A in schema test for table element.
SELECT
COLUMN_NAME
FROM SYSTEM.CATALOG
WHERE TABLE_SCHEM = 'TEST'
AND TABLE_NAME = 'ELEMENT'
AND COLUMN_NAME LIKE 'A%'";
Now I want to use the list of columns names in an UPSERT query from the resultset of above query, to update these columns in the element table's records. So I am stuck here.
try this, it works perfect.
SELECT column_name
FROM system.catalog
WHERE table_name = 'your_table' AND key_seq IS NOT NULL
Example: To get the salt buckets on the table :
select table_name, salt_buckets
from SYSTEM.CATALOG
where salt_buckets is not null and table_name='TABLE_NAME';
When I look at a view/table, I can get the column names using the following SQL query:
SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='table'
Obviously, this will work to show columns for tables; but it does not work for functions. Is there an easy way (besides getting one record from a function, and manually parsing it) to get the column names returned by a function?
Does this help?
SELECT *
FROM INFORMATION_SCHEMA.ROUTINE_COLUMNS
I'm unsure if this works for inline TVFs
I'm using Oracle DB and I would like to write a SQL query that I could then call with JDBC. I'm not very familiar with SQL so if someone can help me, that could be great ! Here is the problem. I have a table MY_TABLE wich contains a list of another tables, and I would like to keep only the nonempty tables and those that their names start by a particular string.
The query I wrote is the following :
select TABLE_NAME
from MY_TABLE
where TABLE_NAME like '%myString%'
and (select count(*) from TABLE_NAME where rownum=1)<>0
order by TABLE_NAME;`
The problem comes from the second SELECT, but I don't know how can I do to use the TABLE_NAME value.
Does someone have an idea ?
Thanks.
[Added from comments]
Actually, I need to test the V$ views contained in the ALL_CATALOG table. But if I can find another table where all these views are contained too and with a NUM_ROWS column too, it would be perfect !
Standard versions of SQL do not allow you to replace 'structural elements' of the query, such as table name or column name, with variable values or place-holders.
There are a few ways to approach this.
Generate a separate SQL statement for each table name listed in MY_TABLE, and execute each in turn. Brute force, but effective.
Interrogate the system catalog directly.
Investigate whether there are JDBC metadata operations that allow you to find out about the number of rows in a table without being tied to the system catalog of the specific DBMS you are using.
Can you use oracle view USER_TABLES? then query will be much easier
select TABLE_NAME
from USER_TABLES
where TABLE_NAME like '%myString%'
and Num_ROWS > 0
order by TABLE_NAME;`
I want to copy many tables with similar names but different prefixes. I want the tables with the wp_ prefix to go into their corresponding tables with the shop_ prefix.
In other words, I want to do something like this:
insert into shop_wpsc_*
select * from wp_wpsc_*
How would you do this?
SQL doesn't allow wildcarding table names - the only way to do this is to loop through a list of tables (via the ANSI INFORMATION_SCHEMA/INFORMATION_SCHEMAS) while using dynamic SQL.
Dynamic SQL is different for every database vendor...
Update
MySQL? Why didn't you say so in the first place...
MySQL's dynamic SQL is called "Prepared Statements" - this is my fav link for it besides the documentation. There're numerous questions on SO about operations on all the tables in a MySQL database - just need to tweak the WHERE clause to get the table names you want.
You'll want to do this from within a MySQL stored procedure...
You can do this by combining multiple statements into a single prepared statement -- try doing this:
SELECT #sql_text := GROUP_CONCAT(
CONCAT('insert into shop_wpsc_',
SUBSTRING(table_name, 9),
' select * from ', table_name, ';'), ' ')
FROM INFORMATION_SCHEMA.TABLES
WHERE table_schema = 'example'
AND table_name LIKE 'wp_wpsc_%';
PREPARE stmt FROM #sql_text;
EXECUTE stmt;
Expanding on OMG Ponies' answer a bit, you can use the data dictionary and write a SQL to write the SQL's. For example, in Oracle, you could do something like this:
SELECT 'insert into shop_wpsc_' || SUBSTR(table_name,9) || ' select * from ' || table_name || ';'
FROM all_tables
WHERE table_name LIKE 'WP_SPSC%'
This will generate a series of SQL statements you can run as a single script. Like OMG Ponies' pointed out though, the syntax will vary depending on what DB vendor you are using (e.g. all_tables is Oracle specific).
First I would select all tables from the catalog views (the name of those may depend on your dmbs, though if they are ansi compatible they should support INFORMATION_SCHEMA) that start with wp_wpsc_.
(For instance for DB2:
SELECT NAME FROM TABLES WHERE NAME LIKE 'wp_wpsc_%'
)
Then iterate through that result set, and create a dynamic statement in the form you have given to read from the current table and insert into the corresponding new one.