Fix “Binder Error” When Using COALESCE() in DuckDB

If you’re getting an error that reads something like “Binder Error: Cannot mix values of type …etc” when using the COALESCE() function in DuckDB, it’s probably because you’re using arguments with incompatible types.

To fix this issue, try using CAST() or TRY_CAST() to ensure that all arguments are compatible. Alternatively, make sure the arguments to COALESCE() are of the same type (or at least, compatible types).

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Fix “No function matches the given name and argument types ‘bool_and(INTEGER)'” in DuckDB

If you’re getting an error that reads something like “No function matches the given name and argument types ‘bool_and(INTEGER)’” in DuckDB, it’s probably because you’re passing a non-boolean value to the bool_and() function.

The bool_and() function is for use against boolean expressions, so to fix this issue, be sure that the argument you pass to the function is a boolean expression.

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Fix Error “AUTOINCREMENT not allowed on WITHOUT ROWID tables” in SQLite

If you’re getting an error that reads “AUTOINCREMENT not allowed on WITHOUT ROWID tables” in SQLite, it appears that you’re trying to define a column as an AUTOINCREMENT in a WITHOUT ROWID table.

SQLite doesn’t allow us to create AUTOINCREMENT columns on WITHOUT ROWID tables.

To address this issue, either remove the AUTOINCREMENT attribute or remove the WITHOUT ROWID from the table definition.

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Fix Error: unknown datatype for (columnname): “DATE” in SQLite

If you’re getting an error that reads something like “unknown datatype for (columnname): “DATE”” in SQLite, it appears that you’re trying to define a column as a DATE type in a strict table.

SQLite doesn’t support the DATE type, however, this error should only occur on strict tables (i.e. a table defined as STRICT).

To fix this issue, either use a supported data type or make the table a regular (non-strict) table.

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Fix “Violation of PRIMARY KEY constraint” in SQL Server (Error 2627)

If you’re getting an error that reads something like “Violation of PRIMARY KEY constraint ‘PK_CatId’. Cannot insert duplicate key in object ‘dbo.Cats’. The duplicate key value is (1)” in SQL Server, it’s because you’re trying to insert a duplicate value into a primary key column.

A primary key cannot contain duplicate values.

To fix this issue, you’ll need to change the value you’re trying to insert into the primary key column.

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Fix Error 137 “Must declare the scalar variable” in SQL Server

If you’re getting SQL Server error 137 that goes something like “Must declare the scalar variable…“, it’s probably because you’re referring to a variable that hasn’t been declared.

If the variable has been declared, it’s possible you’re referring to it incorrectly in the code.

When we use a variable in SQL Server, we must declare the variable first.

To fix this issue, declare the variable. Also be sure to use the right syntax when using it.

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