Fix “At least one of the arguments to COALESCE must be an expression that is not the NULL constant” in SQL Server

In SQL Server, if you’re getting error Msg 4127 that reads “At least one of the arguments to COALESCE must be an expression that is not the NULL constant”, it’s probably because all of your arguments to the COALESCE() expression are the NULL constant.

To fix this issue, make sure at least one argument is not the NULL constant.

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Fix “date is incompatible with int” in SQL Server when Adding to or Subtracting from a Date

If you’re getting error message “Msg 206” that reads “Operand type clash: date is incompatible with int” in SQL Server while trying to add to (or subtract from) a date, it’s probably because you’re trying to perform arithmetic between an integer and a date value.

To fix this issue, either change the date value to a datetime value or use the DATEADD() function.

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Fix “ERROR 1136 (21S01): Column count doesn’t match value count at row 1” when Inserting Data in MariaDB

If you find yourself getting an error that reads something like “ERROR 1136 (21S01): Column count doesn’t match value count at row” in MariaDB, it’s probably because you’ve specified the wrong number of expressions for the number of columns in the column when attempting to insert data into a table.

In other words, you’re trying to insert too many columns or not enough columns.

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Fix “ERROR 3942 (HY000): Each row of a VALUES clause must have at least one column” when using the VALUES Statement in MySQL

If you’re getting an error that reads “ERROR 3942 (HY000): Each row of a VALUES clause must have at least one column” in MySQL, you could have an empty row constructor when using the VALUES statement.

To fix this issue, make sure you’ve got at least one value in each ROW() clause within the VALUES statement.

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Fix “ERROR 1222 (21000): The used SELECT statements have a different number of columns” when using UNION in MariaDB

When using the UNION operator in MariaDB, you may encounter the following error: “ERROR 1222 (21000): The used SELECT statements have a different number of columns”.

This error occurs when the number of columns returned by each SELECT statement is different.

The way to fix this is to ensure that both SELECT statements return the same number of columns.

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Fix “ERROR 1136 (21S01): Column count doesn’t match value count at row 2” when using the VALUES Statement in MySQL

If you’re getting an error that reads something like “ERROR 1136 (21S01): Column count doesn’t match value count at row 2” when using the VALUES statement in MySQL, it’s probably because there’s a mismatch in the number of columns specified in the ROW() clauses.

To fix this error, be sure that all ROW() clauses contain exactly the same number of columns.

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Fix “ERROR: each INTERSECT query must have the same number of columns” in PostgreSQL

When using PostgreSQL’s INTERSECT operator, if you encounter an error that reads “ERROR: each INTERSECT query must have the same number of columns“, it’s because there’s a mismatch in the number of columns returned by the queries on either side of the INTERSECT operator.

The way to fix this is to ensure that both SELECT statements return the same number of columns.

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