In SQLite we can use the upper() function to convert lowercase characters to uppercase.
Tag: how to
2 Ways to Return the Julian Day in SQLite
Here are two methods for returning the Julian Day in SQLite.
The Julian Day is the fractional number of days since noon in Greenwich on November 24, 4714 B.C. It’s the continuous count of days since the beginning of the Julian period, and is used primarily by astronomers, and in software for easily calculating elapsed days between two events.
Continue readingSubtract Years from a Date in PostgreSQL
In PostgreSQL, we can use the - operator to subtract one or more years from a date.
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.
Continue reading7 Ways to Return Duplicate Rows that have a Primary Key in MariaDB
Here are seven ways to return duplicate rows in MariaDB when those rows have a primary key or other unique identifier column.
Therefore, the duplicate rows share exactly the same values across all columns except for their unique identifier column.
Continue readingDetect Whether a Value Contains at Least One Numerical Digit in PostgreSQL
The following example returns all rows that contain at least one numerical digit in PostgreSQL.
Continue readingGenerate INSERT Statements from SQLite Query Results
The SQLite command line interface provides us with the ability to auto-generate SQL INSERT statements from a query. This can be done by changing the output mode to insert.
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.
3 Ways to Delete Duplicate Rows in SQL Server while Ignoring the Primary Key
The following examples use T-SQL to delete duplicate rows in SQL Server while ignoring the primary key or unique identifier column.
More specifically, the examples delete duplicate rows but keep one. So, given two identical rows, one is deleted and the other remains. This is often referred to as “de-duping” the table, “deduplication” of the table, etc.
Continue readingFix “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.