002-几种常见数据库 like 的替代方法

Oracle、MySQL、PostGreSQL、SQL SERVER、HIVE 数据库中 like 替换。

1、包含

like '%xxx%'

# Oracle
instr(str,substr) > 0

# MySQL
locate(substr,str) > 0
position(substr in str) > 0
instr(str,substr) > 0

# PostGreSQL
position(substr in str) > 0

# SQL SERVER
charindex(substr,str) > 0

# HIVE
locate(substr,str) > 0
instr(str,substr) > 0

2、不包含

like '%xxx%'

# Oracle
instr(str,substr) <= 0

# MySQL
locate(substr,str) <= 0
position(substr in str) <= 0
instr(str,substr) <= 0

# PostGreSQL
position(substr in str) <= 0

# SQL SERVER
charindex(substr,str) <= 0

# HIVE
locate(substr,str) <= 0
instr(str,substr) <= 0

3、开头值为

like '%xxx%'

# Oracle
instr(str,substr) = 1

# MySQL
locate(substr,str) = 1
position(substr in str) = 1
instr(str,substr) = 1

# PostGreSQL
position(substr in str) = 1

# SQL SERVER
charindex(substr,str) = 1

# HIVE
locate(substr,str) = 1
instr(str,substr) = 1

4、开头值不为

like '%xxx%'

# Oracle
instr(str,substr) != 1

# MySQL
locate(substr,str) != 1
position(substr in str) != 1
instr(str,substr) != 1

# PostGreSQL
position(substr in str) != 1

# SQL SERVER
charindex(substr,str) != 1

# HIVE
locate(substr,str) != 1
instr(str,substr) != 1

5、结尾值为

like '%xxx%'

# Oracle
instr(str,substr) = length(str)

# MySQL
locate(substr,str) = char_length(str)
position(substr in str) = char_length(str)
instr(str,substr) = char_length(str)

# PostGreSQL
position(substr in str) = length(str)

# SQL SERVER
charindex(substr,str) = len(str)

# HIVE
locate(substr,revserse(str)) = 1
instr(revserse(str),substr) = 1

6、结尾值不为

like '%xxx%'

# Oracle
instr(str,substr) < length(str)

# MySQL
locate(substr,str) < char_length(str)
position(substr in str) < char_length(str)
instr(str,substr) < char_length(str)

# PostGreSQL
position(substr in str) < length(str)

# SQL SERVER
charindex(substr,str) < len(str)

# HIVE
locate(substr,revserse(str)) != 1
instr(revserse(str),substr) != 1