To select all characters except the last n from a string (or put another way, remove last n characters from a string); use the SUBSTRING and CHAR_LENGTH functions together: SELECT col , SUBSTRING(col FROM 1 FOR CHAR_LENGTH(col) – 2) AS col_trimmed — ANSI Syntax , SUBSTRING(col, 1, CHAR_LENGTH(col) – 2) AS col_trimmed — MySQL Syntax … Read more
To get around this issue, wrap your select statement in a CTE, and then you can query against the CTE and use the windowed function’s results in the where clause. WITH MyCte AS ( select employee_id, RowNum = row_number() OVER ( order by employee_id ) from V_EMPLOYEE ORDER BY Employee_ID ) SELECT employee_id FROM MyCte … Read more
Your function has a couple of smallint parameters. But in the call, you are using numeric literals that are presumed to be type integer. A string literal or string constant (‘123’) is not typed immediately. It remains type “unknown” until assigned or cast explicitly. However, a numeric literal or numeric constant is typed immediately. The … Read more
SELECT table1.price, table2.price AS other_price …
You have this python code: c.execute(“insert into medicoes values(?,?,?,?,?,?,?)” % keys) which I think should be c.execute(“insert into medicoes values (?,?,?,?,?,?,?)”, keys) since the % operator expects the string to its left to contain formatting codes. Now all you need to make this work is for keys to be a tuple (or list) containing the … Read more
SELECT count(*) FROM information_schema.columns WHERE table_name=”tbl_ifo”
This will return all the details you want to know select * from information_schema.triggers; or if you want to sort the results of a specific table then you can try SELECT event_object_table ,trigger_name ,event_manipulation ,action_statement ,action_timing FROM information_schema.triggers WHERE event_object_table=”tableName” — Your table name comes here ORDER BY event_object_table ,event_manipulation; the following will return table … Read more
In Postgres functions can be overloaded, so parameters are necessary to distinguish overloaded functions. To unambiguously identify a function you can put only types of its parameters. DROP FUNCTION my_func(INT);
Postgresql historically doesn’t support procedural code at the command level – only within functions. However, in Postgresql 9, support has been added to execute an inline code block that effectively supports something like this, although the syntax is perhaps a bit odd, and there are many restrictions compared to what you can do with SQL … Read more
Yes. See the Join (SQL) > Outer join > Full outer join article on Wikipedia. SELECT employee.*, department.* FROM employee LEFT JOIN department ON employee.DepartmentID = department.DepartmentID UNION ALL SELECT employee.*, department.* FROM department LEFT JOIN employee ON employee.DepartmentID = department.DepartmentID WHERE employee.DepartmentID IS NULL