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MySQLi Articles
Page 248 of 341
How can I update a field in a MySQL database table by adding a value in the second table with a value from the first table?
Let us first create a table −mysql> create table DemoTable1 ( value int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;Output+-------+ | value | +-------+ | 10 | +-------+ 1 row in set (0.00 sec)Following is the query to create second table −mysql> create table DemoTable2 ( value1 int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table ...
Read MoreAdding a new column with the current time as a default value in MySQL?
For this, you can use the DEFAULT CURRENT_TIMESTAMP clause in MySQL. Following is the syntax −CREATE TABLE yourTableName ( yourColumnName1 dataType1, yourColumnName timestamp DEFAULT CURRENT_TIMESTAMP );Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> DueDate timestamp default current_timestamp -> ); Query OK, 0 rows affected (0.86 sec)Now you can insert some records in the table using insert command −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+----+---------------------+ ...
Read MoreSelect column names containing a string in MySQL?
For this, you can use SHOW COLUMNS command. Following is the syntax. Here, we have set the string using LIKE −SHOW COLUMNS FROM yourTableName LIKE ‘yourStringValue’;Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.69 sec)Here is the query to select column names containing a specific string −mysql> SHOW COLUMNS FROM DemoTable LIKE 'FirstName';Output+-----------+-------------+------+-----+----------+-------+ | Field | Type | Null | ...
Read MoreMySQL query to update every alternative row string having same values?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Subject varchar(100) -> ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Subject) values('C'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Subject) values('MongoDB'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(Subject) values('Java'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Subject) values('MongoDB'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Subject) ...
Read MoreFind the greatest value among four tables in MySQL?
To find the greatest value among four tables, you can use the method GREATEST(). Following is the query to create first table −mysql> create table DemoTable1 -> ( -> Value int -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the first table using insert command −mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1 values(60); Query OK, 1 row affected (0.14 sec)Display all records from the first table using select statement −mysql> select *from DemoTable1;Output+-------+ | Value | +-------+ | 10 | ...
Read MoreRemove seconds from MySQL Datetime?
To remove seconds from MySQL datetime, use UPDATE and SET as in the following syntax −update yourTableName set yourDateColumnName=yourDateColumnName -second(yourDateColumnName);Let us first create a table −mysql> create table DemoTable -> ( -> Shippingdatetime datetime -> ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-21 12:05:20'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('2019-03-01 10:23:35'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('2019-06-09 11:00:56'); Query OK, 1 row affected (0.14 sec)Display all records from the table ...
Read MoreWhat is the PHP stripos() equivalent in MySQL?
The stripos() equivalent in MySQL is INSTR(), which returns the position of the first occurrence of a string in another string. Following is the syntax −select instr(yourColumnName, yourWord) As anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (1.22 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('MySQL is my favourite subject'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('MongoDB is not my favourite subject'); Query OK, 1 row affected (0.20 sec)Display ...
Read MoreHow to lowercase the entire string keeping the first letter in uppercase with MySQL?\\n\\n\\n
Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (1.32 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('JOhn'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('CHRIS'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('DAVID'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('RObert'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+--------+ | Name ...
Read MoreOrder by on a specific number in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> status int -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.14 sec) ...
Read MoreSELECT last entry without using LIMIT in MySQL?
For this, you can use subquery. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name) values('John Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Name) values('David Miller'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Name) values('Chris Brown'); Query OK, 1 row affected (0.22 sec)Display all records from the table using select statement −mysql> ...
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