Troubleshooting of PostgreSQL

Troubleshooting of PostgreSQL

How to fix Syntax error: 7 ERROR: LIMIT #,# syntax is not supported

Query syntax mer error

SELECT * 
FROM my_table
LIMIT 0,10

Error message

Uncaught PDOException: SQLSTATE[42601]: Syntax error: 7 ERROR:  LIMIT #,# syntax is not supported                                                         
HINT:  Use separate LIMIT and OFFSET clauses.

Correct query syntax

SELECT * 
FROM my_table
LIMIT 10 OFFSET 0

How to fix ERROR: operator does not exist: ` character varying

The following SQL query has a syntax error:

SELECT `my_columm`
from my_table
LIMIT 10

Error message

ERROR:  operator does not exist: ` character varying
LINE 1: SELECT `content_hash`
               ^
HINT:  No operator matches the given name and argument type. You might need to add an explicit type cast.

To fix the error, update the query with the correct syntax:

SELECT my_columm
from my_table
LIMIT 10

How to fix ERROR: argument of WHERE must be type boolean, not type integer

Query syntax mer error

SELECT * 
FROM my_table
WHERE 1

Correct query syntax

SELECT * 
FROM my_table
WHERE 1 = 1

or

SELECT * 
FROM my_table
WHERE TRUE

How to fix the ERROR: column "count" does not exist

The following SQL query has a syntax error:

SELECT count(*) count, content_hash
from my_table
GROUP BY content_hash
having count >= 2

To fix the error, update the query with the correct syntax:

SELECT count(*) count, content_hash
from my_table
GROUP BY content_hash
having count(*) >= 2

Further reading

• dynamic sql - Why would someone use WHERE 1=1 AND <conditions> in a SQL clause? - Stack Overflow
• Working with Insert Into Ignore in Postgres

The numeric column data all became null after imported

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Template

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