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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to set a string with hyphen and numbers in MySQL varchar?
To set a string with hyphen and numbers, you need to use single quotes. For example, 'Customer-1234-899', 'Customer-9383-901', etc.Let us first create a table −mysql> create table DemoTable -> ( -> CustomerId varchar(100) -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Customer-1234-899'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Customer-8373-900'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Customer-9383-901'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTableOutputThis ...
Read MoreExtract the middle part of column values in MySQL surrounded with hyphens and display in a new column?
Use the SUBSTR() method to extract the middle part of column values surrounded with hyphens, for example, “11-84848-11”.Let us first create a table −mysql> create table DemoTable -> ( -> Number varchar(100), -> Number1 varchar(100) -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Number) values('11-84848-11'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Number) values('22-99999-22'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------+---------+ | Number ...
Read MoreConvert hex string to number in MySQL?
Use the CONV() method to convert hex string to number −select CONV(yourColumnName, 16, 10) AS anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> HexString varchar(100) -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('A'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values('F'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('B'); Query OK, 1 row affected (0.55 sec) mysql> insert into DemoTable values('ABC'); Query OK, 1 row affected (0.11 sec)Display ...
Read MoreMySQL query to display a substring before a special character in a string
Use the LOCATE() and SUBSTRING() method for this in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Introduction To Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Introduction - To MySQL'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------------------+ | Title ...
Read MoreGet the substring of a column in MySQL
Use the SUBSTR() method to get the substring of a column.Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.74 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('This is a MySQL Database'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Java is an Object Oriented Programming Language'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable ;OutputThis will produce the following output −+-------------------------------------------------+ | Title ...
Read MoreDiscard last 3 characters of a field in MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> StudentId varchar(100) -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('STU-090'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('STU-123'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('STU-678'); Query OK, 1 row affected (0.29 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-----------+ | StudentId | +-----------+ | STU-090 | ...
Read MoreComparing two columns in a single MySQL query to get one row?
For this, you can use ORDER BY clause. Let us first create a table −mysql> create table DemoTable -> ( -> Num1 int, -> Num2 int -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(60, 249); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(59, 250); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------+------+ | Num1 | Num2 | +------+------+ | 60 | 249 ...
Read MoreMySQL query to select distinct order by id
For this, use ORDER BY MAX(). Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 'John'); Query OK, 1 row affected (0.51 sec) mysql> insert into DemoTable values(10, 'John'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(20, 'Sam'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(20, 'Sam'); Query OK, 1 row affected (0.11 sec) ...
Read MoreMySQL query to get the count of all the elements in the field?
For this, use the COUNT() method. Let us first create a table −mysql> create table DemoTable -> ( -> ProductName varchar(100) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Product-1'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('Product-2'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Product-3'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Product-3'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('Product-2'); Query OK, 1 row affected ...
Read MoreGeneration of .HEX file using a linker
The file MULT.ASM which is created by using an editor is simply a text file. We cannot execute this file directly. At first we have to assemble the file, and then we have to link it. The step of assembly the translation of the program of assembly language to machine code requires the generation of a .OBJ file.Now a .HEX file is generated by using a linker. We have seen previously that how the naming of the input and output file is done.Input filenameThe source name of the file must be responded by the user. In the given example the ...
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