SQL

2021-4-5 curriculum ——SQL Server query 【3】

This article continues the previous query 【2】, The tables are still the three tables . This article mainly summarizes group query （ Continued ）, j...
2021-04-05 11:13 views 16

Cause: java.sql.SQLSyntaxErrorException: Unknown column ‘name‘ in ‘field

### Cause: java.sql.SQLSyntaxErrorException: Unknown column 'name' in 'field list'; bad SQL grammar []; nested exception is java.sql.SQLSyntaxError...
2021-02-21 22:12 views 358

mysql Batch execute statement _mysql Batch execution sql sentence

tablename Access database :SELECT iif(len(field)>2,left(field,2)+'...',field) FROM tablename; Conn.Execute explain Execute method This met...
2021-02-18 21:01 views 42

Hive SQL How does it work row_number() And so on where condition ?

The preface can be found in this blog , We must have a certain understanding of the basic use of window function , There is no more nonsense here ...
2021-01-29 01:02 views 83

27 Year old invention SQL in the future , God took him away

1974 year , Turing prize winner Charles · Bachman attends a database Conference , I met Edgar · Corder . Codd hasn't got a Turing Award yet , But i...
2021-01-27 08:51 views 39

use c Language pair sql server Add, delete, modify and query

use c Language pair sql server Add, delete, modify and query , since sql server 2000 in the future , No longer support c Embedded language operati...
2021-01-20 18:51 views 22

mysql Batch delete data sql sentence _mysql Batch delete data sql Statement explanation

1.like And in Batch delete specified records like grammar like Mainly used for fuzzy query sql = "delete from A where field like '%ABC%'" This ca...
2021-01-19 07:20 views 49

First knowledge MySQL Comprehensive review （ dried food ）

In daily development and data query , We need to join multiple tables equivalently or left and right to query the related fields. Of course, we ne...
2020-12-25 14:10 views 38

python implement mysql Multiple sql sentence _mysql -- Execute multiple at a time sql sentence

A software upgrade will be done recently , It involves the changes of database table fields ( Add or delete or modify ), All about database change...
2020-12-18 12:59 views 83

sql Grouping statistics _SQL— Summary analysis

one , Summary analysis 1. Summary of knowledge points count: Find the number of rows in a column , If you enter in the function 【 Listing 】 Remove...
2020-12-09 10:13 views 16
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