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Check-in function, data storage time, year, month, day, why use varchar
do a check-in function
`create_time` decimal(20,3) NOT NULL,
`create_date_ymd` varchar(15) NOT NULL COMMENT ,
`create_date_ym` varchar(15) NOT NULL,
`create_date_y` int(4) NOT NULL,
`create_date_m` int(2) NOT NULL,
`create_date_d` int(2) ...
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Does mysql support whether the query condition is an object?
like this SELECT * FROM material WHERE {key:value} limit 1 ...
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PHP MYSQL loops to output a single piece of data sequentially
I want to do a circular sequence to output pictures. Don t know how to write this code?
Table structure
for example, now the field ID of key=1 is 1, 2, 5, 7, 10, 11, 6 fields
I want to output one at a time in order.
output id 1 field for t...
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Mysql cannot log in remotely [red packet]
firewall, the integrated environment of system Centos7, lnmp.org, does not have the permission to run mysql. Iptables has been restarted. Refresh authorization error:
Mysql user:Iptables:
New processing: 1. Modify mysql configuration file vi ...
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The problem of mysql horizontal subtable
if you currently need to generate a table each month to store the current month s data, the following table will be generated:
tablename_201709
tablename_201710
tablename_201711
tablename_201712
tablename_201801
tablename_201802
tablename_201803
table...
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How to read data in batches by mysql
scenario is that there are a series of post (news category) in the database. Now you want to sort according to the post_date in the post table (time), view (browsing), or the likeCount of the post_like table, and read the data in batches. The limit is 2...
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Use mariadb (mysql) php to write an api for your own use.
the api I am talking to now is a request from others. is to use curl to catch the opposite party http. I give it to the opposite party json , and then the opposite party gives back to me json, and then I show it (using mongodb, nodejs) ).
it s just t...
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How to print data through curl?
my mysql database has two pieces of data
when I print_r, it looks like this:
[{"errno":"1","errstr":"2","errfile":"3","errline":"4"},{"errno":"12",...
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The question of whether the fields in mysql sql are calculated or not.
Field id is of type int
select * from table where id= 1 ; select * from table where id=1;
Is there any difference in execution efficiency between the two statements? Is the first line id calculated?
I seem to be the same through explain, but why...
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Ask for advice on MySQL data sheet problems, which is used to store configuration information.
I want to create a table to store the configuration information of the website, but I don t need to add the whole ID into one column. What do you care about this kind of information? ...
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How to design an online seat selection system which can change seat information dynamically?
such as now I want to design an online seat selection system but when users sign up, they can dynamically edit unreserved seats in the background how should I design it from the generation of seats to the final registration, seat selection and editing...
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Php ci framework query mysql returns json array
the effect to be obtained is [{ "name ": "aaa ", "id ": "1 ", "sex ", "man "}, { "name ": "bbb ", "id ": "2 ", "sex ", "woman "}, {}.]
now the display is { "name ": "aaa ", "id ": "1 ", "sex ", "man "} { "name ": "bbb ", "id ": "2 ...
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A notice is sent to the designated person. Seek the most efficient solution.
there is a requirement: A notice is sent to specify who can read it.
the simplest solution to take advantage of mysql:
message Information Table id Information ID name content
< hr >
message_user user View Information Table id message_id Inf...
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High concurrency, how to record the number of clicks, there will be no repetition?
In the high concurrency environment, I want to record the number of clicks per click. The database self-increasing field is id , but there is already a lot of data in it. You can t use id to identify the clicks. If there is any way of thinking, there w...
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Data cannot be queried after mysql preprocessing
when I query a piece of data, I cannot query the data after using parameter binding: the following is the sql to be queried
$sql = SELECT `id` FROM `ct_collection` where `issue`=:issue LIMIT 1 ;
Parameter binding is: 050
SQL: [90] SELECT `id`...
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Database clothing inventory table design?
Hello as shown in the following picture, the inventory table of the clothing industry like this, how to design the database, the color and size of each order may be different.
...
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Sql is correct, but php cannot query it.
I wrote a query in thinkphp, but I couldn t find it out, and then I printed it out .
shows that it is successful. I don t know what s going on. I ask for help from all the great gods .
...
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Mysql is inefficient. I'd like to ask you to take a look at it. What's wrong with it?
one of my websites is php+mysql,. Now there is a problem.
there are two data tables: an and B. Table A has 240000 items of data, and Table B now has 24000 items of data.
extract 50 pieces of data from datasheet A, and then generate a html page. It t...
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Mysql datetime now, appears fine in the database, but it is a different format in web pages.
...
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Problems with website and database import
ask, our company has only one space, there are English website and Chinese website. Now the code and database of Chinese website have been imported, and the English code has also been imported. Can the database of English website be imported? Many of the...
