Below are four ways to list out the tables in a MySQL database using SQL or the command line.
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3 Ways to Find Rows that Contain Uppercase Letters in SQLite
Here are three options for returning rows that contain uppercase characters in SQLite.
Fix “ERROR 1054 (42S22): Unknown column ‘…’ in ‘order clause'” when using UNION in MySQL
If you’re getting error “1054 (42S22): Unknown column ‘…’ in ‘order clause'” when using the UNION clause in MySQL, it could be because you’re trying to reference an aliased column by its column name.
Subtract Days from a Date in PostgreSQL
We can subtract one or more days from a date in PostgreSQL with the - operator.
Fix “ERROR 1136 (21S01): Column count doesn’t match value count at row 1” when Inserting Data in MySQL
One of the more common error message in MySQL goes like this: “ERROR 1136 (21S01): Column count doesn’t match value count at row 1“.
This error typically occurs when you’re trying to insert data into a table, but the number of columns that you’re trying to insert don’t match the number of columns in the table.
In other words, you’re either trying to insert too many columns, or not enough columns.
11 Ways to Find Duplicate Rows while Ignoring the Primary Key in SQLite
Here are eleven options for returning duplicate rows in SQLite when those rows have a primary key or some other unique identifier column (but you want to ignore the primary key).
This means that the duplicate rows share exactly the same values across all columns with the exception of their primary key/unique ID column.
Fix Error “ORA-01789: query block has incorrect number of result columns”
If you’re getting the error “ORA-01789: query block has incorrect number of result columns” in Oracle Database, then it’s probably because you’re trying to use an operator such as UNION, INTERSECT, or EXCEPT to run a compound query, but the SELECT statements on either side of the operator return a different number of columns.
To fix this, simply ensure that both queries return the same number of columns.
Detect Whether a Value Contains at Least One Numerical Digit in Oracle
The following example returns all rows that contain at least one numerical digit in Oracle Database.
Fix “ERROR 1250 (42000): Table ‘…’ from one of the SELECTs cannot be used in ORDER clause” in MariaDB
If you’re getting “ERROR 1250 (42000): Table ‘…’ from one of the SELECTs cannot be used in ORDER clause”, it’s probably because you’re qualifying a column name with its table name when using an operator such as UNION, INTERSECT, or EXCEPT in MariaDB.
To fix this, either remove the table name or use a column alias.