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Database Articles
Page 297 of 547
Fetch the first letter of a column value and insert it in another column with MySQL
For this, use the concept of LEFT() function. Let us first create a table −mysql> create table DemoTable2036 -> ( -> FirstLetter varchar(20), -> Title varchar(20) -> ); Query OK, 0 rows affected (1.01 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2036(Title) values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable2036(Title) values('John'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable2036(Title) values('Adam'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable2036;This will produce the ...
Read MoreValidate Date in MySQL using a custom function
Let us create a custom function to validate date in MySQL −mysql> set global log_bin_trust_function_creators=1; Query OK, 0 rows affected (0.03 sec) mysql> delimiter // mysql> create function isValidDate(actualDate varchar(255)) returns int -> begin -> declare flag int; -> if (select length(date(actualDate)) IS NOT NULL ) then -> set flag = 1; -> else -> set flag = 0; -> end if; -> return flag; -> end -> // Query OK, 0 rows affected (0.11 sec) mysql> delimiter ;Case 1 −When parameter is null value i.e. the date to be ...
Read MoreDisplay TRUE FALSE records as 0 1 in MySQL
Set the column as BOOLEAN to display 0 and 1 values. Let us create a table −mysql> create table DemoTable2035 -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> isMarried boolean, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2035(Name, isMarried) values('Chris', true); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable2035(Name, isMarried) values('David', false); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable2035(Name, isMarried) values('Bob', true); Query OK, 1 ...
Read MoreImplement Dynamic SQL query inside a MySQL stored procedure?
For dynamic SQL query in a stored procedure, use the concept of PREPARE STATEMENT. Let us first create a table −mysql> create table DemoTable2033 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2033(Name) values('Chris'); Query OK, 1 row affected (0.85 sec) mysql> insert into DemoTable2033(Name) values('Bob'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable2033(Name) values('David'); Query OK, 1 row affected (0.24 sec) mysql> insert into ...
Read MoreCalculating byte values to megabyte (MB) in MySQL?
Here, we are taking BIGINT type, since it takes 8 byte signed integer. Let us first create a table with column as BIGINT type −mysql> create table DemoTable2031 -> ( -> ByteValue bigint -> ); Query OK, 0 rows affected (1.17 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2031 values(1048576); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable2031 values(1073741824); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable2031;This will produce the following output −+------------+ | ByteValue | ...
Read MoreFind maximum value from a VARCHAR column in MySQL
To find maximum value, use MAX() along with CAST(), since the values are of VARCHAR type. Let us first create a table −mysql> create table DemoTable2030 -> ( -> Value varchar(20) -> ); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2030 values('8'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable2030 values('1'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable2030 values('10001'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable2030 values('901'); Query OK, 1 row affected ...
Read MoreUpdate the content of a specific cell in MySQL
Let us first create a table −mysql> create table DemoTable2029 -> ( -> Id int, -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.98 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2029 values(1, 'Chris', 'Brown') -> ; Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable2029 values(2, 'David', 'Miller'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2029 values(3, 'John', 'Smith'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable2029 values(4, 'John', 'Brown'); Query OK, 1 ...
Read MoreHow to write a valid MySQL query and update with a custom variable?
Let us first create a table −mysql> create table DemoTable2027 -> ( -> UserId int -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2027 values(10); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable2027 values(20); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable2027 values(31); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2027 values(11); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable2027;This will produce ...
Read MoreCan we add minutes to VARCHAR datetime records while applying INSERT statement in MySQL?
Yes, we can add minutes while inserting values in a table.Let us first create a table. Here, we have a column with VARCHAR records where inmysql> create table DemoTable2026 -> ( -> ArrivalTime varchar(20) -> ); Query OK, 0 rows affected (0.40 sec)Insert some records in the table using insert command. We are first converting the VARCHAR date and then adding minutes −mysql> insert into DemoTable2026 values(date_add(str_to_date('2017-12-01 11:34:45', '%Y-%m-%d %H:%i:%s'), INTERVAL 10 MINUTE)); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable2026 values(date_add(str_to_date('2015-01-31 10:00:00', '%Y-%m-%d %H:%i:%s'), INTERVAL 5 MINUTE)); Query OK, 1 row affected ...
Read MoreFind and replace a part of URL records in MySQL?
The simplest way to replace records is using MySQL REPLACE() −mysql> create table DemoTable2025 -> ( -> URL text -> ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2025 values('http=//www.facebook.com'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable2025 values('http=//www.google.com'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable2025 values('http=//www.gmail.com'); Query OK, 1 row affected (0.26 sec)Display all records from the table using select statement −mysql> select *from DemoTable2025;This will produce the following output −+-------------------------+ | URL ...
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