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sql – How to resolve Oracle error ORA-01790? – Stack Overflow
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- Summary of article content: Articles about sql – How to resolve Oracle error ORA-01790? – Stack Overflow Cause: A SELECT list item corresponds to a SELECT list item with a different datatype in another query of the same set expression. Action: Check … …
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Oracle / PLSQL: ORA-01790 Error Message
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- Summary of article content: Articles about Oracle / PLSQL: ORA-01790 Error Message Learn the cause and how to resolve the ORA-01790 error message in Oracle. You tried to execute a SELECT statement (probably a UNION query or a UNION ALL … …
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sql – How to resolve Oracle error ORA-01790? – Tech Notes Help
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- Summary of article content: Articles about sql – How to resolve Oracle error ORA-01790? – Tech Notes Help ORA-01790: expression must have same datatype as corresponding expression · Cause: A SELECT list item corresponds to a SELECT list item with a … …
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How to resolve ora-01790: expression must have same datatype as corresponding expression in unpivot query (Oracle, plsql, development) – Quora
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- Summary of article content: Articles about How to resolve ora-01790: expression must have same datatype as corresponding expression in unpivot query (Oracle, plsql, development) – Quora This error is most commonly caused by mismatched column datatypes in UNION queries For example SELECT varchar, varchar, varchar FROM a_table UNION SELECT … …
- Most searched keywords: Whether you are looking for How to resolve ora-01790: expression must have same datatype as corresponding expression in unpivot query (Oracle, plsql, development) – Quora This error is most commonly caused by mismatched column datatypes in UNION queries For example SELECT varchar, varchar, varchar FROM a_table UNION SELECT … This error is most commonly caused by mismatched column datatypes in UNION queries For example SELECT varchar, varchar, varchar FROM a_table UNION SELECT varchar, varchar, varchar FROM b_table This will work SELECT varchar, varchar, varchar FROM a…
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Oracle 19cR1 ORA-01790 expression must have same datatype as corresponding expression
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- Summary of article content: Articles about Oracle 19cR1 ORA-01790 expression must have same datatype as corresponding expression Oracle Database Error Code ORA-01790 Description … Cause: An attempt was made to create a table or view with more than 1000 columns, or to add more columns to a … …
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How to resolve Oracle error ORA-01790?
Clearly the issue for the poster was solved over half a decade ago, nonetheless I wanted to point out to anyone reading this post in search of help that the order of the selected properties (columns) must match from one unioned statement to the next. It is not enough to simply have the names and the data types match, though that is in a sense the root cause. But due to the way the Union statements are handled in Oracle, it is possible to get the ORA-01790 error due to a mismatch in the ordering of columns only.
In my case, I had a query with a UNION ALL of two selects. One select had a column named “generic_column_name” as the 25th item in the select, and the other select had that same column named “generic_column_name” of the very same data type (I tested several ways through hard coding and also using forced data type conversions). However the second select had this item in the 19th place, so all of the columns from there on were offset and this triggered the ORA-01790 error.
Fix Error “ORA-01790: expression must have same datatype as corresponding expression”
If you’re getting the error “ORA-01790: expression must have same datatype as corresponding expression” in Oracle Database, it’s probably because you’re using an operator such as UNION , INTERSECT , or EXCEPT to run a compound query, but the columns returned by each query use different data type groups.
To fix this issue, you’ll need to ensure that each column returned by the second query uses the same data type group as the corresponding column in the first query.
Example of Error
Here’s an example of code that produces this error:
SELECT TeacherName FROM Teachers UNION SELECT StudentId FROM Students;
Result:
ORA-01790: expression must have same datatype as corresponding expression
The problem here, is that I’m trying to combine the TeacherName column in the first query, with the StudentId column in the second query.
In my case, the TeacherName column is a varchar(50) column but the StudentId column is an int column. This causes the error to occur.
Solution 1
The first (and probably most common) solution to the above error is to ensure that we have the correct column/s in each query.
In my case, it seems quite obvious that I passed the wrong columns. Therefore, I can modify the above query as follows:
SELECT TeacherName FROM Teachers UNION SELECT StudentName FROM Students;
Result:
TEACHERNAME Ben Bill Cathy Ein Faye Jet Spike Warren
Or I could do the following:
SELECT TeacherId, TeacherName FROM Teachers UNION SELECT StudentId, StudentName FROM Students;
Result:
TEACHERID TEACHERNAME 1 Faye 1 Warren 2 Ben 2 Jet 3 Cathy 3 Spike 4 Cathy 4 Ein 5 Bill 5 Warren 6 Bill
In both cases, the column types returned by the second query matched the types returned by the first query.
Solution 2
In some cases, you may find that you’ve got the correct columns, but their types don’t match. In such cases, you may need to convert one of the columns to a different data type.
Using our example, we could do this:
SELECT TeacherName FROM Teachers UNION SELECT TO_CHAR(StudentId) FROM Students;
Result:
TEACHERNAME 1 2 3 4 5 6 Ben Bill Cathy Warren
sql – How to resolve Oracle error ORA-01790? – Tech Notes Help
sql – How to resolve Oracle error ORA-01790?
Without looking at your SQL, I would guess that you have columns being UNIONed that have different data types.
Heres what found:
ORA-01790: expression must have same datatype as corresponding expression
Cause: A SELECT list item corresponds to a SELECT list item with a different datatype in another query of the same set expression.
Action: Check that all corresponding SELECT list items have the same datatypes. Use the TO_NUMBER, TO_CHAR, and TO_DATE functions to do explicit data conversions.
I havent seen your query, but I am guessing that one select in your union is not selecting the same columns as the other.
sql – How to resolve Oracle error ORA-01790?
Clearly the issue for the poster was solved over half a decade ago, nonetheless I wanted to point out to anyone reading this post in search of help that the order of the selected properties (columns) must match from one unioned statement to the next. It is not enough to simply have the names and the data types match, though that is in a sense the root cause. But due to the way the Union statements are handled in Oracle, it is possible to get the ORA-01790 error due to a mismatch in the ordering of columns only.
In my case, I had a query with a UNION ALL of two selects. One select had a column named generic_column_name as the 25th item in the select, and the other select had that same column named generic_column_name of the very same data type (I tested several ways through hard coding and also using forced data type conversions). However the second select had this item in the 19th place, so all of the columns from there on were offset and this triggered the ORA-01790 error.
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