SQLPLUS error:ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA
You’re missing service name: EDIT If you can connect to the database from other computer try running there: and
Database
MySQL combine two columns into one column
My guess is that you are using MySQL where the + operator does addition, along with silent conversion of the values to numbers. If a value does not start with a digit, then the converted value is 0. So try this: Two ways to add a space:
Oracle – ORA-01489: result of string concatenation is too long [duplicate]
You are exceeding the SQL limit of 4000 bytes which applies to LISTAGG as well. As a workaround, you could use XMLAGG. For example, If you want to concatenate multiple columns which itself have 4000 bytes, then you can concatenate the XMLAGG output of each column to avoid the SQL limit of 4000 bytes. For example,
difference between primary key and unique key
Primary Key: There can only be one primary key constraint in a table In some DBMS it cannot be NULL – e.g. MySQL adds NOT NULL Primary Key is a unique key identifier of the record Unique Key: Can be more than one unique key in one table Unique key can have NULL values It can be a candidate key … Read more
Host ‘xxx.xx.xxx.xxx’ is not allowed to connect to this MySQL server
Possibly a security precaution. You could try adding a new administrator account: Although as Pascal and others have noted it’s not a great idea to have a user with this kind of access open to any IP. If you need an administrative user, use root, and leave it on localhost. For any other action specify … Read more
SELECT list is not in GROUP BY clause and contains nonaggregated column …. incompatible with sql_mode=only_full_group_by
This Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘returntr_prod.tbl_customer_pod_uploads.id’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by will be simply solved by changing the sql mode in MySQL by this command, This too works for me.. I used this, … Read more
MySQL: Invalid use of group function
You need to use HAVING, not WHERE. The difference is: the WHERE clause filters which rows MySQL selects. Then MySQL groups the rows together and aggregates the numbers for your COUNT function. HAVING is like WHERE, only it happens after the COUNT value has been computed, so it’ll work as you expect. Rewrite your subquery as:
MySQL Error 1093 – Can’t specify target table for update in FROM clause
Update: This answer covers the general error classification. For a more specific answer about how to best handle the OP’s exact query, please see other answers to this question In MySQL, you can’t modify the same table which you use in the SELECT part.This behaviour is documented at: http://dev.mysql.com/doc/refman/5.6/en/update.html Maybe you can just join the table … Read more
1052: Column ‘id’ in field list is ambiguous
SQL supports qualifying a column by prefixing the reference with either the full table name: …or a table alias: The table alias is the recommended approach — why type more than you have to? Why Do These Queries Look Different? Secondly, my answers use ANSI-92 JOIN syntax (yours is ANSI-89). While they perform the same, … Read more