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On the Database query Optimization of java programmers in interview
background: 1. I am a java programmer 2. Recently interviewed for a senior development position 3. The previous project mainly used less oracle,mysql, and the companies interviewed basically used mysql s 4. I am weak in the database 5. Recently, I...
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Oracle database insertion problem of Mybatise
when using Mybatise, I use the following code to operate on the database. No error is reported, and it executes successfully, but the database does not find data
@Test
public void testInsertUser(){
SqlSession sqlSession = sessionFactory.o...
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Tomcat has been running for a period of time, but it has not been reported correctly, but it cannot be accessed.
tomcat can be accessed normally at the beginning, but after a week or two of operation, it cannot be accessed normally, and it does not report an error, but it just cannot be accessed, which is very strange. jdk and tomcat are both 32-bit, is that the r...
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User amount flow table, how to sub-table?
every amount change of the user is recorded in this table. website users about 100W, now the table is too big, thought of sub-table, how to divide it? Table structure! user id is a 32-bit guid ...
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What is stored in the database is the html code, how to blur the contents of the query tag?
what is stored in the database is the html code, which is mainly a piece of div content, including the style, does not contain the body and other tags, and the label is strict in opening and closing. If I want to query the keyword "class " now, if I us...
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Oracle database, the structure of the two tables is different. How about inserting the fields in table a + newly assigned fields into table b? Ask for advice, see description for details.
enter the order number on the page to query the data in Table A, extract some of the field values in Table A to the page, and make changes. The other field values remain the same.
insert the modified value and the unmodified field into the new table b...
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How does Entity Framework Core connect to the Oracle database?
how does Entity Framework Core connect to the Oracle database? ...
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The usage of as in sql query statement;
is currently self-learning mysql,. When querying, sometimes you need to use as aliases, but after adding as aliases to the following two query statements, why is it incorrect?
1, select cat_id,goods_name,shop_price from goods where shop_price in (sele...
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How PHP handles Spatial data SDO_GEOMETRY objects
PHP oracle GEOLOCPHP
I printed the data type of this field, and it turned out to be 108, and Baidu didn t have it for half a day .
...
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Invalid ORA-01722: number, the field type of both tables is varchar (2)?
when writing insert sql statements with python + cx_oracle, the error message is an invalid ORA-01722: number. The field types of the two tables are the same, and they are executed in PL SQL, and the field that reported the error is found. But after loo...
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An Analysis of the Business scenario of Synchronize
The business scenario is as follows: I provide a ws server A for client B to call. Each call, the client inserts a piece of data into the database tab and then submits it. My server An internally calls another server C, and passes this data to the serve...
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Date-time format conversion of Python connecting to Oracle database through cx_Oracle?
1. Process: Python looks up the data in the table through cx_Oracle and inserts the data into another table.
2. The type of date and time stored in both tables is of type Date.
3. The time field I took from the query table prints out that the type i...
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My side of the project code is UTF-8, nearly 2 days before the launch of the customer said that the assigned database is GBK, and the database code can not be changed, is there any solution?
big head. ...
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Oracle beginner problem, number of connections
what is the relationship between the number of oracle, connections, session sessions and users? assuming that the default number of connections installed is 150, is it true that the total number of connections for all users cannot be greater than 150? Or...
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Error results after using ORDER BY on emp datasheet
conn c-sharp-sharpscott tiger
SELECT * FROM emp ORDER BY hiredate;
output the following result: if you do not specify whether the sort is ascending or descending, it should be sorted in ascending or descending order, but you can see that the data is...
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Perform a second screening from the result set
as shown in the figure, this association query is different in that it is associated with the same table
indicates that table_test
requirement: first query the result set of the field whose reply_type is 0, and then use the reply_id of the resul...
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Multiple tables query the last 100 pieces of data?
how do I query the last 100 pieces of data in multiple tables in the ORACLE database? For example, the two tables of An and B have a time field, and the last 100 items of data in tables An and B are not the last 100 items in An and B. ...
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What type is used in golang to receive the sys_refcursor returned by Oracle stored procedures?
Code:
stmt, err := db.Prepare("begin TestPro(:1,:2,:3);end;")
if err != nil {
return "",err
}
defer stmt.Close()
var mail string = "1"
var pwd string = "2"
var op_re_list string
var result sql.Result
result,e...
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How do I update the value of the same field in multiple tables?
problem description
orcaleABCAPHONEBPHONECPHONE:
A B C
ID PHONE ID PHONE ID PHONE
a1 11111 b1 11111 c1 11111
a1 22222 b2 33333 c2 11111
now I want to change the PHONE=11111 in ...
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Why do I set the isolation level of the database and still produce dirty read data when I call the method to update the system prompt?
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