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Displaying posts with tag: sql (reset)
SQL Upper Function Example | MySQL And SQL Server Upper()

SQL UPPER function is used for converting all the characters in the source string to Uppercase characters. If any number is present in the string, then it remains unaffected. SQL UPPER() function converts a string to the upper-case.

SQL upper() Function

Suppose you have the online shopping website. Customers visit the website and provide the necessary information while creating the login account.

Each customer provides few compulsory information such as first name, last name, phone number, email address, and residential address.

Each customer is different, so you cannot expect the similar format for all inputs.

For example, you get a following entries in an SQL table.

We do not see all words following the consistent pattern.

It does not look good as well if you have to share the report daily to higher management for all newly enrolled customers.


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How to Improve MySQL AWS Performance 2X Over Amazon RDS at The Same Cost

AWS is the #1 cloud provider for open-source database hosting, and the go-to cloud for MySQL deployments. As organizations continue to migrate to the cloud, it’s important to get in front of performance issues, such as high latency, low throughput, and replication lag with higher distances between your users and cloud infrastructure. While many AWS users default to their managed database solution, Amazon RDS, there are alternatives available that can improve your MySQL performance on AWS through advanced customization options and unlimited EC2 instance type support. ScaleGrid offers a compelling alternative to hosting MySQL on AWS that offers better performance, more control, and no cloud vendor lock-in and the same price as Amazon RDS. In this post, we compare the performance of MySQL Amazon RDS …

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MySQL 8.0.18 was just released, and it contains a brand new feature to analyze and understand how queries are executed: EXPLAIN ANALYZE.

What is it?

EXPLAIN ANALYZE is a profiling tool for your queries that will show you where MySQL spends time on your query and why.…

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SQL LTRIM Function Example | LTRIM In MySQL And SQL Server

SQL LTRIM Function Example is today’s topic. SQL LTRIM function is used for removing all the leading whitespaces or specified characters from the string, i.e. from the left-hand side of the string. In this tutorial, you will learn how to use a MySQL and SQL Server LTRIM() function to remove leading blanks from a string. Oracle/PLSQL LTRIM function removes all specified characters from the left-hand side of a string.

SQL LTRIM Function

The LTRIM() function returns the string after removing leading blanks.

The following shows the syntax of the LTRIM() function.

SELECT LTRIM (input_string, [trim_string])


Input_string: It is the string from where the characters have to be removed from the left-hand side.

Trim_string: It is completely optional. It is mainly used for specifying the characters to be removed. If this parameter is omitted, then …

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SQL LOWER Function | Lower() Function In MySQL and SQL Server

Lower() Function Example In MySQL and SQL Server is today’s topic. The SQL LOWER function converts all the characters in a string into lowercase. If you want to convert all characters in a string into uppercase, you should use the UPPER function. SQL LOWER function is used for lowering the case of a string, i.e. all the characters in the specified string will be converted to lower case. This is one of the String functions.

SQL LOWER Function

See the following syntax.

SELECT LOWER (input_string)


Input_string: It is the string whose characters are to be converted to lowercase. The input string can be any string or any table column.


If any …

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SQL Left Function Example | LEFT() In SQL Server And MySQL

SQL Left Function Example | LEFT() In SQL Server And MySQL is today’s topic. LEFT FUNCTION in SQL is used for extracting a substring starting from the left, followed by the number of characters. The LEFT() function extracts several characters from the string (starting from left).

SQL Left Function

The LEFT() function extracts a given number of characters from the left side of a supplied string.

The syntax of the LEFT() function is as follows.

SELECT LEFT (string, no_of_characters);

See the following parameters.


  1. String: An input string from which the substring will be extracted and can be a literal string, variable or a column.
  2. No_of_characters: Number of characters you wish to extract from the string.

The LEFT() function returns a value of VARCHAR when …

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How to Map MySQL’s TINYINT(1) to Boolean in jOOQ

MySQL 8 does not yet support the BOOLEAN type as specified in the SQL standard. There is a DDL “type” called BOOL, which is just an alias for TINYINT:

create table t(b bool);

from information_schema.columns
where table_name = 't';

The above produces:

t         |b          |tinyint  |tinyint(1) |

Notice that BOOL translates to a specific “type” of TINYINT, a TINYINT(1), where we might be inclined to believe that the (1) corresponds to some sort of precision, as with …

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SQL CONCAT_WS Function Example | CONCAT_WS Method In SQL

SQL CONCAT_WS Function Example | CONCAT_WS Method In SQL is today’s topic. The SQL CONCAT_WS function is used to join two or more expressions separated by a separator. It takes up to 255 input strings which are further joined by a function. If we want to perform the join operation, CONCAT requires at least 2 strings. If it is provided with only 1 string, it will raise the error.


If any non-character string values are passed into the function, it will be implicitly converted to the strings before concatenating.

If NULL is added to the function, it converts it into the empty string with VARCHAR (1).

See the following syntax.

SELECT CONCAT_WS (separator, expression1, expression2, expression3…)

Parameters Separator

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SQL DIFFERENCE Function Example | Understanding Difference Method

SQL DIFFERENCE Function Example | Understanding Difference Method is today’s topic. SQL DIFFERENCE function is used for returning the difference between the Soundex values. A Soundex value is four characters long. If two strings sound the same, then their Soundex values will be the same. If two strings sound entirely different, then none of the characters Soundex values will be the same.


The SQL DIFFERENCE, one of the String Function, compares two SOUNDEX values, and returns the integer.

An integer value indicates the match for the two SOUNDEX values, from 0 to 4. The 0 indicates weak or no similarity between the SOUNDEX values. 4 indicates strong similarity or identically SOUNDEX values.

For example, peace and piece sound the same so that they will have the same Soundex values.

SELECT SOUNDEX ('piece') AS Piece, SOUNDEX ('Peace') AS Peace;

See the …

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SQL CHARINDEX Function Example

SQL CHARINDEX Function Example is today’s topic. SQL CHARINDEX function is used for returning the location of a substring of a given string. SQL CHARINDEX function is not case-sensitive. SQL CHARINDEX function searches for a substring inside a string starting from a specified location.

It returns the position of the substring found in the searched string, or zero if the substring is not found. The starting position returned is 1-based, not 0-based.


The CHARINDEX() function searches for a substring in a string and returns the position. If the substring is not found, this function returns 0. The function performs a case-insensitive search.

See the following syntax.

SELECT CHARINDEX (substring, input_string, [start_position] )


  1. Substring: The substring that you want to find within the input_string.
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